Information processing device, information processing method, and program

ABSTRACT

Provided is an information processing device including an acquisition unit that acquires a first captured image, a second captured image, and a distance to a subject, and a derivation unit that derives an imaging position distance which is a distance between the first imaging position and the second imaging position, on the basis of a plurality of pixel coordinates for specifying a plurality of pixels of more than three pixels which are present in the same planar region as an emission position irradiated with the directional light beam on the real space and correspond to the position on the real space in each of the first captured image and the second captured image which are acquired by the acquisition unit, emission position coordinates which are derived on the basis of the distance acquired by the acquisition unit, a focal length of an imaging lens, and dimensions of imaging pixels.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. Ser. No. 15/954,627, filed Apr. 17, 2018, which is a continuation application of International Application No. PCT/JP2016/081597, filed Oct. 25, 2016. Further, this application claims priority from Japanese Patent Application No. 2015-218642, filed Nov. 6, 2015. The entire disclosures of all of the above applications are incorporated herein by reference.

BACKGROUND 1. Technical Field

The technique of the present disclosure relates to an information processing device, an information processing method, and a program.

2. Related Art

There has been known a distance measurement device that performs distance measurement on the basis of a reciprocating time of a laser beam emitted by an emitting unit toward a subject assumed to be a distance measurement target by a user (see, for example, JP2012-167944A). Meanwhile, in this specification, the distance measurement refers to measurement of a distance from the distance measurement device to a subject to be measured.

In addition, as a type of distance measurement device, there is also known a distance measurement device equipped with a three-dimensional coordinate calculation function which is a function of calculating three-dimensional coordinates of a subject.

As a method for realizing the three-dimensional coordinate calculation function, JP3095463B discloses a three-dimensional measurement method of calculating three-dimensional coordinates of a plurality of measurement points of an object to be measured from image data, which is obtained by imaging using two or more cameras, by a triangulation method.

The three-dimensional measurement method disclosed in JP3095463B includes the following steps 1 to 5. In step 1, four or more reference point members and reference bars are disposed within fields of view of two or more cameras. In step 2, the reference point members and the reference bars are imaged by the two or more cameras, and angles in the horizontal direction and the vertical direction of the reference point members and the reference bars with respect to an optical axis of each camera are obtained from image data obtained by the imaging. In step 3, a relative positional relationship between the reference point members, the reference bars, and the two or more cameras is obtained from data of the angles of the reference point members and the reference bars.

In step 4, absolute positions and poses of the two or more cameras are calculated from the obtained relative positional relationship and a distance between two reference bars. In step 5, three-dimensional coordinates of a plurality of measurement points of an object to be measured are calculated from image data, which is obtained by the two or more cameras, by a triangulation method on the basis of the calculated absolute positions and poses of the two or more cameras.

In addition, as a device for realizing a three-dimensional coordinate calculation function, JP2013-122434A discloses a three-dimensional position measurement device including a monocular imaging device to which irradiation means having an irradiation light source emitting a laser beam is fixed.

The three-dimensional position measurement device disclosed in JP2013-122434A captures an image of a calibration plate as a subject by moving the calibration plate while irradiating the calibration plate with a laser beam or captures an image of the calibration plate as a subject from two imaging positions by moving an imaging device. In addition, the three-dimensional position measurement device disclosed in JP2013-122434A calculates three-dimensional coordinates of an emission position of a laser beam in each image from the captured images, and calculates a direction vector or a plane equation of the laser beam. The three-dimensional position measurement device disclosed in JP2013-122434A calculates three-dimensional coordinates of an object to be irradiated with a laser beam by using the calculated direction vector or plane equation.

SUMMARY

However, in the technique disclosed in JP3095463B, it is necessary to use the reference point members and the reference bars, it is not possible to calculate three-dimensional coordinates of a plurality of measurement points of an object to be measured under a situation where it is not possible to use the reference point members and the reference bars.

In the technique disclosed in JP2013-122434A, the calibration plate has a plurality of characteristic locations, and the characteristic locations of the calibration plate are irradiated with a laser beam. However, in a case where any subject, such as an existing building, is irradiated with a laser beam, it is considered that the subject does not have a characteristic location to be irradiated with a laser beam. In a case where the subject does not have a characteristic location, it is difficult to irradiate the same location with a laser beam from different positions. As a result, in the technique disclosed in JP2013-122434A, it is also difficult to calculate three-dimensional coordinates of an object to be irradiated with a laser beam.

As another method of calculating three-dimensional coordinates, a method of calculating three-dimensional coordinates on the basis of a first captured image, a second captured image, and an imaging position distance is considered. Here, the first captured image refers to an image obtained by imaging a subject from a first imaging position, and the second captured image refers to an image obtained by imaging the subject from a second imaging position different from the first imaging position. In addition, the imaging position distance refers to a distance between the first imaging position and the second imaging position.

In a case where three-dimensional coordinates are calculated on the basis of the first captured image, the second captured image, and the imaging position distance, it is necessary to obtain the imaging position distance with a high level of accuracy. The imaging position distance can be calculated, for example, when distance measurement is performed by using a predetermined location which is a characteristic location capable of being specified and a subject including the predetermined location can be imaged from each of the first imaging position and the second imaging position. The calibration plate makes it possible to provide the predetermined location to a user, but the imaging position distance cannot be calculated in a case where the characteristic location capable of being specified is not irradiated with a laser beam under a situation where the calibration plate cannot be used.

One embodiment of the invention is contrived in view of such situations, and provides an information processing device, an information processing method, and a program which are capable of deriving an imaging position distance on the basis of captured images obtained by imaging a subject from each of different imaging positions even when a characteristic location capable of being specified is not irradiated with a laser beam.

An information processing device of a first aspect of the invention includes an acquisition unit that acquires a first captured image obtained by imaging a subject from a first imaging position, a second captured image obtained by imaging the subject from a second imaging position different from the first imaging position, and a distance from one of a position corresponding to the first imaging position and a position corresponding to the second imaging position to the subject, the distance being measured by emitting directional light, which has directivity, to the subject and receiving a reflected light of the directional light, and a derivation unit that derives an imaging position distance which is a distance between the first imaging position and the second imaging position, on the basis of a plurality of pixel coordinates being a plurality of coordinates for satisfying the plurality of pixels of more than three pixels which are present in the same planar region as an emission position irradiated with the directional light on the real space and correspond to the position on the real space in each of the first captured image and the second captured image which are acquired by the acquisition unit, emission position coordinates which specifies the emission position on the real space and are derived on the basis of the distance acquired by the acquisition unit, a focal length of an imaging lens used for the imaging of the subject, and dimensions of imaging pixels included in an imaging pixel group for imaging the subject.

Therefore, according to the information processing device of the first aspect of the invention, it is possible to derive the imaging position distance on the basis of captured images obtained by imaging the subject from each of different imaging positions even when a characteristic location capable of being specified is not irradiated with a laser beam.

In the information processing device of a second aspect of the invention according to the information processing device of the first aspect of the invention, the derivation unit derives designated pixel real space coordinates, which are coordinates of designated pixels on the real space which are designated as pixels corresponding to the position on the real space in each of the first captured image and the second captured image which are acquired by the acquisition unit, on the basis of the derived imaging position distance.

Therefore, according to the information processing device of the second aspect of the invention, it is possible to derive designated pixel real space coordinates even when a characteristic location capable of being specified is not irradiated with a laser beam.

In the information processing device of a third aspect of the invention according to the information processing device of the second aspect of the invention, the designated pixel real space coordinates are specified on the basis of the imaging position distance, the focal length, and the dimensions.

Therefore, according to the information processing device of the third aspect of the invention, it is possible to derive the designated pixel real space coordinates with a high level of accuracy, as compared to a case where the designated pixel real space coordinates are not specified on the basis of the imaging position distance, the designated pixel coordinates, the focal length of the imaging lens, and the dimensions of the imaging pixel.

In the information processing device of a fourth aspect of the invention according to the information processing device of any one of the first to third aspects of the invention, the derivation unit derives a direction of a plane, including coordinates on the real space which correspond to the plurality of pixel coordinates, which is specified by a plane equation indicating the plane on the basis of the plurality of pixel coordinates, the focal length, and the dimensions, decides the plane equation on the basis of the derived direction and the emission position coordinates, and derives the imaging position distance on the basis of the decided plane equation, the focal length, and the dimensions.

Therefore, according to the information processing device of the fourth aspect of the invention, it is possible to derive the imaging position distance with a high level of accuracy, as compared to a case where the imaging position distance is derived without using the plane equation in a case where a characteristic location capable of being specified is not irradiated with a laser beam.

In the information processing device according to a fifth aspect of the invention according to the information processing device of any one of the first to fourth aspects, the plurality of pixels are designated by first pixel designation information for designating a pixel from each of the first captured image and the second captured image, the first pixel designation information being received by a first reception unit receiving the first pixel designation information, the acquisition unit acquires a plurality of coordinates for specifying the plurality of pixels designated in accordance with the first pixel designation information as the plurality of pixel coordinates, and the derivation unit derives the imaging position distance on the basis of the plurality of pixel coordinates acquired by the acquisition unit, the emission position coordinates, the focal length, and the dimensions.

Therefore, according to the information processing device of the fifth aspect of the invention, it is possible to derive the imaging position distance on the basis of a plurality of pixel coordinates acquired by a user's intention.

In the information processing device of a sixth aspect of the invention according to the information processing device of any one of the first to fourth aspects of the invention, the acquisition unit acquires a plurality of coordinates, as the plurality of pixel coordinates, for specifying a plurality of characteristic pixels more than three pixels which are present in the same planar region as the emission position on the real space and correspond to the position on the real space in each of the first captured image and the second captured image, and the derivation unit derives the imaging position distance on the basis of the plurality of pixel coordinates acquired by the acquisition unit, the emission position coordinates, the focal length, and the dimensions.

Therefore, according to the information processing device of the sixth aspect of the invention, it is possible to derive the imaging position distance on the basis of a plurality of pixel coordinates with a small number of operations, as compared to a case where a plurality of pixels for specifying the plurality of pixel coordinates are designated by the user in acquiring the plurality of pixel coordinates used for the derivation of the imaging position distance.

In the information processing device of a seventh aspect of the invention according to the information processing device of the sixth aspect of the invention, the plurality of characteristic pixels are a predetermined number of pixels more than three pixels which are present in the same planar region as the emission position on the real space and correspond to the position on the real space in each of the first captured image and the second captured image, and are a plurality of pixels for maximizing an area surrounded.

Therefore, according to the information processing device of the seventh aspect of the invention, it is possible to derive the imaging position distance with a high level of accuracy, as compared to a case where a plurality of pixels not for maximizing an area surrounded are adopted as the plurality of characteristic pixels.

The information processing device of an eighth aspect of the invention according to the information processing device of the sixth aspect of the invention further includes a first control unit that performs control of displaying at least one of the first captured image and the second captured image on a first display unit, and displaying a corresponding region corresponding to the same planar region as the emission position within a display region so as to be distinguishable from the other regions, in which the acquisition unit acquires a plurality of coordinates for specifying the plurality of characteristic pixels as the plurality of pixel coordinates, from a portion of the corresponding region designated in accordance with region designation information received by a second reception unit receiving the region designation information for designating a portion of the corresponding region in a state where the corresponding region is displayed on the first display unit.

Therefore, according to the information processing device of the eighth aspect of the invention, it is possible to acquire a plurality of pixel coordinates with a small load, as compared to a case where the plurality of pixel coordinates are acquired from the entire corresponding region.

In the information processing device of a ninth aspect of the invention according to the information processing device of any one of the first to eighth aspects of the invention, the designated pixel, which is related to one of the first captured image and the second captured image among the designated pixels designated as a pixel corresponding to the position on the real space in each of the first captured image and the second captured image which are acquired by the acquisition unit, is a pixel designated in accordance with second pixel designation information received by a third reception unit receiving the second pixel designation information for designating a pixel from one of the first captured image and the second captured image, and the designated pixel related to the other one of the first captured image and the second captured image is a pixel which is included in the other one of the first captured image and the second captured image and corresponds to a position of the pixel designated in accordance with the second pixel designation information on the real space.

Therefore, according to the information processing device of the ninth aspect of the invention, it is possible to rapidly determine a designated pixel related to both the first captured image and the second captured image, as compared to a case where the designated pixel related to both the first captured image and the second captured image is designated by the user.

The information processing device of a tenth aspect of the invention according to the information processing device of any one of the first to ninth aspects of the invention further includes a measurement unit that measures the distance by emitting the directional light and receiving the reflected light, in which the acquisition unit acquires the distance measured by the measurement unit.

Therefore, according to the information processing device of the tenth aspect of the invention, it is possible to easily acquire the distance used for the derivation of the emission position coordinates, as compared to a case where the measurement unit is not provided.

The information processing device of an eleventh aspect of the invention according to the information processing device of any one of the first to tenth aspects of the invention further includes an imaging unit that images the subject, in which the acquisition unit that acquires the first captured image obtained by imaging the subject by the imaging unit from the first imaging position, and the second captured image obtained by imaging the subject by the imaging unit from the second imaging position.

Therefore, according to the information processing device of the eleventh aspect of the invention, it is possible to easily acquire the first captured image and the second captured image which are used to obtain the designated pixel coordinates and the plurality of pixel coordinates, as compared to a case where the imaging unit is not provided.

In the information processing device of a twelfth aspect of the invention according to the information processing device of any one of the first to eleventh aspects of the invention, the acquisition unit further acquires a reference distance to the subject which is measured by emitting the directional light to the subject from the other one of the position corresponding to the first imaging position and the position corresponding to the second imaging position and receiving the reflected light of the directional light, and the derivation unit further derives a reference imaging position distance which is the distance between the first imaging position and the second imaging position on the basis of the plurality of pixel coordinates, reference emission position coordinates for specifying the emission position on the real space and derived on the basis of the reference distance acquired by the acquisition unit, the focal length, and the dimensions, and adjusts the imaging position distance with reference to the derived reference imaging position distance to derive a final imaging position distance which is finally adopted as the distance between the first imaging position and the second imaging position.

Therefore, according to the information processing device of the twelfth aspect of the invention, it is possible to derive the distance between the first imaging position and the second imaging position with a high level of accuracy, as compared to a case where the reference imaging position distance is not used.

In the information processing device of a thirteenth aspect of the invention according to the information processing device of the twelfth aspect of the invention, the derivation unit derives final designated pixel real space coordinates, which are finally adopted as the coordinates of the designated pixels on the real space which are designated as pixels corresponding to the position on the real space in each of the first captured image and the second captured image which are acquired by the acquisition unit, on the basis of the derived final imaging position distance.

Therefore, according to the information processing device of the thirteenth aspect of the invention, it is possible to derive the coordinates of the designated pixel on the real space with a high level of accuracy, as compared to a case where the coordinates of the designated pixel on the real space are derived without using the final imaging position distance derived with reference to the reference imaging position distance.

In the information processing device of a fourteenth aspect of the invention according to the information processing device of the thirteenth aspect of the invention, the final designated pixel real space coordinates are specified on the basis of the final imaging position distance, the focal length, and the dimensions.

Therefore, according to the information processing device of the fourteenth aspect of the invention, it is possible to derive the final designated pixel real space coordinates with a high level of accuracy, as compared to a case where the final designated pixel real space coordinates are not specified on the basis of the final imaging position distance, the designated pixel coordinates, the focal length of the imaging lens, and the dimensions of the imaging pixel.

The information processing device of a fifteenth aspect of the invention according to the information processing device of any one of the first to fourteenth aspects of the invention further includes a second control unit that performs control of displaying derivation results of the derivation unit on a second display unit.

Therefore, according to the information processing device of the fifteenth aspect of the invention, it is possible to make the user easily recognize the derivation results of the derivation unit, as compared to a case where the derivation results of the derivation unit are not displayed.

An information processing method of a sixteenth aspect of the invention includes acquiring a first captured image obtained by imaging a subject from a first imaging position, a second captured image obtained by imaging the subject from a second imaging position different from the first imaging position, and a distance from one of a position corresponding to the first imaging position and a position corresponding to the second imaging position to the subject, the distance being measured by emitting directional light, which has directivity, to the subject and receiving a reflected light of the directional light, and deriving an imaging position distance which is a distance between the first imaging position and the second imaging position, on the basis of a plurality of pixel coordinates being a plurality of coordinates for specifying a plurality of pixels of more than three pixels which are present in the same planar region as an emission position irradiated with the directional light on the real space and correspond to the position on the real space in each of the acquired first captured image and second captured image, emission position coordinates which specifies the emission position on the real space and are derived on the basis of the acquired distance, a focal length of an imaging lens used for the imaging of the subject, and dimensions of imaging pixels included in an imaging pixel group for imaging the subject.

Therefore, according to the information processing method of the sixteenth aspect of the invention, it is possible to derive the imaging position distance on the basis of captured images obtained by imaging the subject from each of different imaging positions even when a characteristic location capable of being specified is not irradiated with a laser beam.

A program of a seventeenth aspect of the invention, the program causing a computer to execute processes of acquiring a first captured image obtained by imaging a subject from a first imaging position, a second captured image obtained by imaging the subject from a second imaging position different from the first imaging position, and a distance from one of a position corresponding to the first imaging position and a position corresponding to the second imaging position to the subject, the distance being measured by emitting directional light, which has directivity, to the subject and receiving a reflected light of the directional light, and deriving an imaging position distance which is a distance between the first imaging position and the second imaging position, on the basis of a plurality of pixel coordinates being a plurality of coordinates for specifying a plurality of pixels of more than three pixels which are present in the same planar region as an emission position irradiated with the directional light on the real space and correspond to the position on the real space in each of the acquired first captured image and second captured image, emission position coordinates which specifies the emission position on the real space and are derived on the basis of the acquired distance, a focal length of an imaging lens used for the imaging of the subject, and dimensions of imaging pixels included in an imaging pixel group for imaging the subject.

Therefore, according to the program of the seventeenth aspect of the invention, it is possible to derive the imaging position distance on the basis of captured images obtained by imaging the subject from each of different imaging positions even when a characteristic location capable of being specified is not irradiated with a laser beam.

According to one embodiment of the invention, it is possible to obtain an effect that an imaging position distance can be derived on the basis of captured images obtained by performing imaging from each of different imaging positions even when a characteristic location capable of being specified is not irradiated with a laser beam.

BRIEF DESCRIPTION OF THE DRAWINGS

Exemplary embodiments according to the technique of the present disclosure will be described in detail based on the following figures, wherein:

FIG. 1 is a front view illustrating an example of the appearance of a distance measurement device according to first to fifth embodiments;

FIG. 2 is a block diagram illustrating an example of a hardware configuration of the distance measurement device according to the first to fourth embodiments;

FIG. 3 is a time chart illustrating an example of a measurement sequence of the distance measurement device according to the first to sixth embodiments;

FIG. 4 is a time chart illustrating an example of a laser trigger, a light emission signal, a light receiving signal, and a count signal which are required in a case where measurement is performed once by the distance measurement device according to the first to sixth embodiments;

FIG. 5 is a graph illustrating an example of a histogram (histogram in a case where a distance (measured value) to a subject is represented by a lateral axis and the number of times of measurement is represented by a vertical axis) of measured values obtained by the measurement sequence of the distance measurement device according to the first to sixth embodiments;

FIG. 6 is a block diagram illustrating an example of a hardware configuration of a main control unit included in the distance measurement device according to the first to sixth embodiments;

FIG. 7 is a schematic plan view illustrating an example of a positional relationship between the distance measurement device and the subject according to the first to fourth embodiments and the sixth embodiment;

FIG. 8 is a conceptual diagram illustrating an example of a positional relationship between a portion of the subject, a first captured image, a second captured image, a principal point of an imaging lens at a first imaging position, and a principal point of the imaging lens at a second imaging position;

FIG. 9 is a block diagram illustrating an example of a main function of a CPU according to the first to sixth embodiments;

FIG. 10 is a diagram illustrating a method of calculating emission position coordinates according to the first to sixth embodiments;

FIG. 11 is a flowchart illustrating an example of a flow of an imaging position distance calculation process according to the first embodiment;

FIG. 12 is the continuation of the flowchart illustrated in FIG. 11;

FIG. 13 is a conceptual diagram illustrating an example of a subject included in an imaging range of an imaging device according to the first to sixth embodiments;

FIG. 14 is a schematic image illustrating an example of the first captured image obtained by the imaging device according to the first embodiment;

FIG. 15 is a schematic image illustrating an example of the first captured image obtained by the imaging device according to the first embodiment;

FIG. 16 is a schematic image illustrating an example of the first captured image obtained by the imaging device according to the first embodiment;

FIG. 17 is a schematic image illustrating an example of the first captured image obtained by the imaging device according to the first embodiment;

FIG. 18 is a flowchart illustrating an example of a flow of a three-dimensional coordinate calculation process according to the first embodiment;

FIG. 19 is a schematic image illustrating an example of the second captured image obtained by the imaging device according to the first embodiment;

FIG. 20 is a schematic image illustrating an example of the first captured image obtained by the imaging device according to the first embodiment;

FIG. 21 is a flowchart illustrating an example of a flow of an imaging position distance calculation process according to the second embodiment;

FIG. 22 is a schematic image illustrating an example of a first captured image obtained by an imaging device according to the second embodiment;

FIG. 23 is a schematic image illustrating an example of the first captured image obtained by the imaging device according to the second embodiment;

FIG. 24 is a flowchart illustrating an example of a flow of an imaging position distance calculation process according to the third embodiment;

FIG. 25 is the continuation of the flowchart illustrated in FIG. 24;

FIG. 26 is a flowchart illustrating an example of a flow of an imaging position distance calculation process according to the fourth embodiment;

FIG. 27 is a schematic image illustrating an example of a second captured image obtained by an imaging device according to the fourth embodiment;

FIG. 28 is a flowchart illustrating an example of a flow of a three-dimensional coordinate calculation process according to the fourth embodiment;

FIG. 29 is a schematic image illustrating an example of the second captured image obtained by the imaging device according to the fourth embodiment;

FIG. 30 is a schematic plan view illustrating an example of a positional relationship between two distance measurement devices, a PC, and a subject according to the fifth embodiment;

FIG. 31 is a block diagram illustrating an example of a hardware configuration of a distance measurement device according to the fifth embodiment;

FIG. 32 is a block diagram illustrating an example of a hardware configuration of the PC according to the fifth embodiment;

FIG. 33 is a block diagram illustrating an example of a hardware configuration of a distance measurement device according to the sixth embodiment;

FIG. 34 is a screen view illustrating an example of a screen including various buttons displayed as soft keys on a display unit of a smart device included in the distance measurement device according to the sixth embodiment;

FIG. 35 is a conceptual diagram illustrating an example of a mode in which an imaging position distance calculation program and a three-dimensional coordinate calculation program are installed in the distance measurement device or the PC from a storage medium in which the imaging position distance calculation program and the three-dimensional coordinate calculation program according to the first to fourth embodiments are stored; and

FIG. 36 is a front view illustrating a modification example of the appearance of the distance measurement device according to the first to sixth embodiments.

DETAILED DESCRIPTION

Hereinafter, an example of an embodiment according to a technique of this disclosure will be described with reference to the accompanying drawings. Meanwhile, in this embodiment, for convenience of description, a distance from a distance measurement device 10A to a subject to be measured will be also simply referred to as a “distance” or a “distance to a subject”. In this embodiment, an angle of view with respect to a subject will be also simply referred to as an “angle of view”.

First Embodiment

As illustrated in FIG. 1 as an example, the distance measurement device 10A which is an example of an information processing device according to the technique of this disclosure includes a distance measurement unit 12 and an imaging device 14. Meanwhile, in this embodiment, the distance measurement unit 12 and a distance measurement control unit 68 to be described later (see FIG. 2) are examples of a measurement unit according to the technique of this disclosure, and the imaging device 14 is an example of an imaging unit according to the technique of this disclosure.

The imaging device 14 includes a lens unit 16 and an imaging device main body 18, and the lens unit 16 is detachably attached to the imaging device main body 18.

A hot shoe (Hot Shoe) 20 is provided on the left surface of the imaging device main body 18 in a front view, and the distance measurement unit 12 is detachably attached to the hot shoe 20.

The distance measurement device 10A has a distance measurement system function of emitting a laser beam for distance measurement to the distance measurement unit 12 to perform distance measurement and an imaging system function of causing the imaging device 14 to image a subject to obtain a captured image. Meanwhile, hereinafter, a captured image will be also simply referred to as an “image”. In addition, hereinafter, for convenience of description, a description will be given on the assumption that the height of an optical axis L1 (see FIG. 2) of a laser beam emitted from the distance measurement unit 12 is the same as the height of an optical axis L2 (see FIG. 2) of the lens unit 16 in the vertical direction.

The distance measurement device 10A operates the distance measurement system function to perform a measurement sequence (see FIG. 3) once in accordance with one instruction, and one distance is finally output by the measurement sequence being performed once,

The distance measurement device 10A has a still image imaging mode and a movie imaging mode as an operation mode of the imaging system function. The still image imaging mode is an operation mode for capturing a still image, and the movie imaging mode is an operation mode for capturing a moving image. The still image imaging mode and the movie imaging mode are selectively set in accordance with a user's instruction.

As illustrated in FIG. 2 as an example, the distance measurement unit 12 includes an emitting unit 22, a light receiving unit 24, and a connector 26.

The connector 26 can be connected to the hot shoe 20, and the distance measurement unit 12 is operated under the control of the imaging device main body 18 in a state where the connector 26 is connected to the hot shoe 20.

The emitting unit 22 includes a Laser Diode (LD) 30, a condensing lens (not shown), an objective lens 32, and an LD driver 34.

The condensing lens and the objective lens 32 are provided along the optical axis L1 of a laser beam emitted by the LD 30, and are disposed in this order along the optical axis L1 from the LD 30 side.

The LD 30 emits a laser beam for distance measurement which is an example of a directional light according to the technique of this disclosure. The laser beam emitted by the LD 30 is a colored laser beam, and a real space emission position which is an emission position on the real space of the laser beam is visually recognized on the real space and is also visually recognized from a captured image obtained by the imaging device 14, for example, within a range of approximately several meters from the emitting unit 22. Meanwhile, hereinafter, for convenience of description, the real space emission position of the laser beam will also be simply referred to as an “emission position”.

The condensing lens condenses a laser beam emitted by the LD 30, and transmits the condensed laser beam. The objective lens 32 faces a subject, and emits the laser beam passing through the condensing lens to the subject.

The LD driver 34 is connected to the connector 26 and the LD 30, and drives the LD 30 in accordance with an instruction of the imaging device main body 18 to emit a laser beam.

The light receiving unit 24 includes a Photo Diode (PD) 36, an objective lens 38, and a light receiving signal processing circuit 40. The objective lens 38 is disposed on a light receiving surface side of the PD 36, and a reflected laser beam which is a laser beam emitted by the emitting unit 22 and reflected from the subject is incident on the objective lens 38. The objective lens 38 transmits the reflected laser beam and guides the reflected laser beam to the light receiving surface of the PD 36. The PD 36 receives the reflected laser beam having passed through the objective lens 38, and outputs an analog signal based on the amount of light received, as a light receiving signal.

The light receiving signal processing circuit 40 is connected to the connector 26 and the PD 36, amplifies the light receiving signal, which is input from the PD 36, by an amplifier (not shown), and performs Analog/Digital (A/D) conversion on the amplified light receiving signal. The light receiving signal processing circuit 40 outputs the light receiving signal digitalized by the A/D conversion to the imaging device main body 18.

The imaging device 14 includes mounts 42 and 44. The mount 42 is provided in the imaging device main body 18, and the mount 44 is provided in the lens unit 16. The lens unit 16 is exchangeably mounted on the imaging device main body 18 by the mount 44 being coupled to the mount 42.

The lens unit 16 includes an imaging lens 50, a zoom lens 52, a zoom lens moving mechanism 54, and a motor 56.

Subject light which is light reflected from the subject is incident on the imaging lens 50. The imaging lens 50 transmits the subject light and guides the subject light to the zoom lens 52.

The zoom lens 52 is attached to the zoom lens moving mechanism 54 so as to be slidable with respect to the optical axis L2. In addition, the motor 56 is connected to the zoom lens moving mechanism 54, and the zoom lens moving mechanism 54 receives the power of the motor 56 to make the zoom lens 52 slide along the direction of the optical axis L2.

The motor 56 is connected to the imaging device main body 18 through the mounts 42 and 44, and driving is controlled in accordance with a command from the imaging device main body 18. Meanwhile, in this embodiment, a stepping motor is applied as an example of the motor 56. Therefore, the motor 56 is operated in synchronization with a pulse power on the basis of a command from the imaging device main body 18.

The imaging device main body 18 includes an imaging element 60, a main control unit 62, an image memory 64, an image processing unit 66, a distance measurement control unit 68, a motor driver 72, an imaging element driver 74, an image signal processing circuit 76, and a display control unit 78. In addition, the imaging device main body 18 includes a touch panel interface (I/F) 79, a reception I/F 80, and a media I/F 82.

The main control unit 62, the image memory 64, the image processing unit 66, the distance measurement control unit 68, the motor driver 72, the imaging element driver 74, the image signal processing circuit 76, and the display control unit 78 are connected to a bus line 84. In addition, the touch panel I/F 79, the reception I/F 80, and the media I/F 82 are also connected to the bus line 84.

The imaging element 60 is a Complementary Metal Oxide Semiconductor (CMOS) type image sensor, and includes color filters (not shown). The color filters include a G filter corresponding to green (G), an R filter corresponding to red (R), and a B filter corresponding to blue (B) which most contribute to the obtainment of a brightness signal. The imaging element 60 includes an imaging pixel group 60A including a plurality of imaging pixels 60A1 arranged in a matrix. Any one filter of the R filter, the G filter, and the B filter included in the color filters is allocated to each of the imaging pixels 60A1, and the imaging pixel group 60A receives the subject light to image the subject.

That is, the subject light having passed through the zoom lens 52 is imaged on the light receiving surface of the imaging element 60, and charge based on the amount of subject light received is accumulated in the imaging pixels 60A1. The imaging element 60 outputs the charge accumulated in the imaging pixels 60A1 as an image signal indicating an image equivalent to a subject image which is obtained by imaging the subject light on the light receiving surface.

The main control unit 62 controls the entire distance measurement device 10A through the bus line 84.

The motor driver 72 is connected to the motor 56 through the mounts 42 and 44, and controls the motor 56 in accordance with an instruction of the main control unit 62.

The imaging device 14 has a viewing angle changing function. The viewing angle changing function is a function of changing an angle of view by moving the zoom lens 52, and is realized by the zoom lens 52, the zoom lens moving mechanism 54, the motor 56, the motor driver 72, and the main control unit 62 in this embodiment. Meanwhile, in this embodiment, an optical viewing angle changing function of the zoom lens 52 is described. However, the technique of this disclosure is not limited thereto, an electronic viewing angle changing function not using the zoom lens 52 may be used.

The imaging element driver 74 is connected to the imaging element 60, and provides a driving pulse to the imaging element 60 under the control of the main control unit 62. The imaging pixels 60A1 included in the imaging pixel group 60A are driven in accordance with the driving pulse supplied to the imaging element 60 by the imaging element driver 74.

The image signal processing circuit 76 is connected to the imaging element 60, and reads out an image signal for one frame from the imaging element 60 for each imaging pixel 60A1 under the control of the main control unit 62. The image signal processing circuit 76 performs various processing, such as correlative double sampling processing, automatic gain control, and A/D conversion, on the read-out image signal. The image signal processing circuit 76 outputs an image signal, which is digitalized by performing various processing on the image signal, to the image memory 64 for each frame at a specific frame rate (for example, several tens of frames per second) which is specified by a clock signal supplied from the main control unit 62. The image memory 64 temporarily holds the image signal which is input from the image signal processing circuit 76.

The imaging device main body 18 includes a display unit 86, a touch panel 88, a reception device 90, and a memory card 92.

The display unit 86 which is an example of each of a first display unit and a second display unit according to the technique of this disclosure is connected to the display control unit 78, and displays various information under the control of the display control unit 78. The display unit 86 is realized by, for example, a Liquid Crystal Display (LCD).

The touch panel 88 which is an example of each of first to third reception units according to the technique of this disclosure is superimposed on a display screen of the display unit 86, and receives a touch of a user's finger or an indicator such as a touch pen. The touch panel 88 is connected to the touch panel I/F 79, and outputs positional information indicating a position touched by the indicator to the touch panel I/F 79. The touch panel I/F 79 operates the touch panel 88 in accordance with an instruction of the main control unit 62, and outputs the positional information, which is input from the touch panel 88, to the main control unit 62. Meanwhile, in this embodiment, the touch panel 88 is described as an example of the first to third reception units according to the technique of this disclosure, but the invention is not limited thereto. A mouse (not shown) used by being connected to the distance measurement device 10A may be applied instead of the touch panel 88, or the touch panel 88 and the mouse may be used in combination.

The reception device 90 includes a measurement and imaging button 90A, an imaging button 90B, an imaging system operation mode switching button 90C, a wide angle instruction button 90D, and a telephoto instruction button 90E. In addition, the reception device 90 also includes an imaging position distance calculation button 90F, a three-dimensional coordinate calculation button 90G, and the like, and receives the user's various instructions. The reception device 90 is connected to the reception I/F 80, and the reception I/F 80 outputs an instruction content signal indicating contents of an instruction received by the reception device 90 to the main control unit 62.

The measurement and imaging button 90A is a pressing type button that receives an instruction for starting measurement and imaging. The imaging button 90B is a pressing type button that receives an instruction for starting imaging. The imaging system operation mode switching button 90C is a pressing type button that receives an instruction for switching between a still image imaging mode and a movie imaging mode.

The wide angle instruction button 90D is a pressing type button that receives an instruction for setting an angle of view to be a wide angle, and the amount of change of the angle of view to the wide angle side is determined depending on a pressing time for which the pressing of the wide angle instruction button 90D is continuously performed within an allowable range.

The telephoto instruction button 90E is a pressing type button that receives an instruction for setting an angle of view to be at a telephoto side, the amount of change of the angle of view to the telephoto side is determined depending on a pressing time for which the pressing of the telephoto instruction button 90E is continuously performed within an allowable range.

The imaging position distance calculation button 90F is a pressing type button that receives an instruction for starting an imaging position distance calculation process to be described later. The three-dimensional coordinate calculation button 90G is a pressing type button that receives an instruction for starting an imaging position distance calculation process to be described later and a three-dimensional coordinate calculation process to be described later.

Meanwhile, hereinafter, for convenience of description, the measurement and imaging button 90A and the imaging button 90B will be referred to as a “release button” in a case where it is not necessary to give a description by distinguishing between the buttons. In addition, hereinafter, for convenience of description, the wide angle instruction button 90D and the telephoto instruction button 90E will be referred to as an “angle of view instruction button” in a case where it is not necessary to give a description by distinguishing between the buttons.

Meanwhile, in the distance measurement device 10A according to this embodiment, a manual focus mode and an autofocus mode are selectively set in accordance with the user's instruction through the reception device 90. The release button receives two-stage pressing operations of an imaging preparation instruction state and an imaging instruction state. The imaging preparation instruction state refers to, for example, a state where the release button is pressed to an intermediate position (half pressing position) from a waiting position, and the imaging instruction state refers to a state where the release button is pressed to a final pressing position (full pressing position) beyond the intermediate position. Meanwhile, hereinafter, for convenience of description, the “state where the release button is pressed to the half pressing position from the waiting position” will be referred to as a “half pressing state”, and the “state where the release button is pressed to the full pressing position from the waiting position” will be referred to as a “full pressing state”.

In the autofocus mode, the adjustment of imaging conditions is performed by the release button being set to be in a half pressing state. Thereafter, when the release button is subsequently set to be in a full pressing state, the actual exposure is performed. That is, after exposure adjustment is performed by the operation of an Automatic Exposure (AE) function by the release button being set to be in a half pressing state prior to the actual exposure, focus adjustment is performed by the operation of an Auto-Focus (AF) function, and the actual exposure is performed when the release button is set to be in a full pressing state.

Here, the actual exposure refers to exposure performed to obtain a still image file to be described later. In this embodiment, the exposure means exposure performed to obtain a live view image to be described later and exposure performed to obtain a moving image file to be described later, in addition to the actual exposure. Hereinafter, for convenience of description, the exposures will be simply referred to as “exposure” in a case where it is not necessary to give a description by distinguishing between the exposures.

Meanwhile, in this embodiment, the main control unit 62 performs exposure adjustment based on an AE function and focus adjustment based on an AF function. In this embodiment, a case where the exposure adjustment and the focus adjustment are performed is described. However, the technique of this disclosure is not limited thereto, and the exposure adjustment or the focus adjustment may be performed.

The image processing unit 66 acquires an image signal for each frame from the image memory 64 at a specific frame rate, and performs various processing, such as gamma correction, brightness and color difference conversion, and compression processing, on the acquired image signal.

The image processing unit 66 outputs the image signal, which is obtained by performing various processing, to the display control unit 78 for each frame at a specific frame rate. In addition, the image processing unit 66 outputs the image signal, which is obtained by performing various processing, to the main control unit 62 in accordance with a request of the main control unit 62.

The display control unit 78 outputs the image signal, which is input from the image processing unit 66, to the display unit 86 for each frame at a specific frame rate under the control of the main control unit 62.

The display unit 86 displays an image, character information, and the like. The display unit 86 displays an image shown by the image signal, which is input from the display control unit 78 at a specific frame rate, as a live view image. The live view image is a consecutive frame image which is obtained by consecutive imaging, and is also referred to as a through-image. In addition, the display unit 86 also displays a still image which is a single frame image obtained by performing imaging using a single frame. Further, the display unit 86 also displays a reproduced image, a menu screen, and the like, in addition to the live view image.

Meanwhile, in this embodiment, the image processing unit 66 and the display control unit 78 are realized by an Application Specific Integrated Circuit (ASIC), but the technique of this disclosure is not limited thereto. For example, each of the image processing unit 66 and the display control unit 78 may be realized by a Field-Programmable Gate Array (FPGA). In addition, the image processing unit 66 may be realized by a computer including a Central Processing Unit (CPU), a Read Only Memory (ROM), and a Random Access Memory (RAM). In addition, the display control unit 78 may also be realized by a computer including a CPU, a ROM, and a RAM. Further, each of the image processing unit 66 and the display control unit 78 may be realized by a combination of a hardware configuration and a software configuration.

The main control unit 62 controls the imaging element driver 74 to cause the imaging element 60 to perform exposure for each frame in a case where an instruction for capturing a still image is received by the release button under a still image imaging mode. The main control unit 62 acquires an image signal, which is obtained by performing the exposure for each frame, from the image processing unit 66 and performs compression processing on the acquired image signal to generate a still image file having a specific still image format. Meanwhile, here, the specific still image format refers to, for example, Joint Photographic Experts Group (JPEG).

The main control unit 62 acquires an image signal, which is output to the display control unit 78 as a signal for a live view image by the image processing unit 66, for each frame at a specific frame rate in a case where an instruction for capturing a moving image is received by the release button under a movie imaging mode. The main control unit 62 performs compression processing on the image signal acquired from the image processing unit 66 to generate a moving image file having a specific moving image format. Meanwhile, here, the specific moving image format refers to, for example, Moving Picture Experts Group (MPEG). Meanwhile, hereinafter, for convenience of description, the still image file and the moving image file will be referred to as an image file in a case where it is not necessary to give a description by distinguishing between the image files.

The media I/F 82 is connected to the memory card 92, and performs the recording and read-out of the image file on the memory card 92 under the control of the main control unit 62. Meanwhile, the image file which is read out from the memory card 92 by the media I/F 82 is subjected to extension processing by the main control unit 62 to be displayed on the display unit 86 as a reproduced image.

Meanwhile, the main control unit 62 stores distance information, which is input from the distance measurement control unit 68, in the memory card 92 through the media I/F 82 in association with the image file. The distance information is read out together with the image file by the main control unit 62 from the memory card 92 through the media I/F 82, and a distance indicated by the read-out distance information is displayed on the display unit 86 together with the reproduced image based on the associated image file.

The distance measurement control unit 68 controls the distance measurement unit 12 under the control of the main control unit 62. Meanwhile, in this embodiment, the distance measurement control unit 68 is realized by an ASIC, but the technique of this disclosure is not limited thereto. For example, the distance measurement control unit 68 may be realized by a FPGA. In addition, the distance measurement control unit 68 may be realized by a computer including a CPU, a ROM, and a RAM. Further, the distance measurement control unit 68 may be realized by a combination of a hardware configuration and a software configuration.

The hot shoe 20 is connected to the bus line 84, and the distance measurement control unit 68 controls the LD driver 34 to control the emission of a laser beam by the LD 30 under the control of the main control unit 62 and acquires a light receiving signal from the light receiving signal processing circuit 40. The distance measurement control unit 68 derives a distance to the subject on the basis of a timing when the laser beam is emitted and a timing when the light receiving signal is acquired, and outputs distance information indicating the derived distance to the main control unit 62.

Here, the measurement of a distance to the subject by the distance measurement control unit 68 will be described in more detail.

As illustrated in FIG. 3 as an example, one measurement sequence by the distance measurement device 10A is specified by a voltage adjustment period, a real measurement period, and a pause period.

The voltage adjustment period is a period in which driving voltages of the LD 30 and the PD 36 are adjusted. The real measurement period is a period in which a distance to the subject is actually measured. In the real measurement period, an operation of causing the LD 30 to emit a laser beam and causing the PD 36 to receive the reflected laser beam is repeated several hundred times, and a distance to the subject is derived on the basis of a timing when the laser beam is emitted and a timing when the light receiving signal is acquired. The pause period is a period for stopping the driving of the LD 30 and the PD 36. Accordingly, in one measurement sequence, the measurement of a distance to the subject is performed several hundred times.

Meanwhile, in this embodiment, each of the voltage adjustment period, the real measurement period, and the pause period is set to be several hundred milliseconds.

As illustrated in FIG. 4 as an example, a count signal for specifying a timing when the distance measurement control unit 68 gives an instruction for emitting a laser beam and a timing when a light receiving signal is acquired is provided to the distance measurement control unit 68. In this embodiment, the count signal is generated by the main control unit 62 and is supplied to the distance measurement control unit 68. However, the invention is not limited thereto, and the control signal may be generated by a dedicated circuit, such as a time counter, which is connected to the bus line 84, and may be supplied to the distance measurement control unit 68.

The distance measurement control unit 68 outputs a laser trigger for emitting a laser beam to the LD driver 34 in accordance with the count signal. The LD driver 34 drives the LD 30 to emit a laser beam in accordance with the laser trigger.

In the example illustrated in FIG. 4, a light emission time of a laser beam is set to be several tens of nanoseconds. In this case, a time until the laser beam, which is emitted toward a subject positioned several kilometers ahead by the emitting unit 22, is received by the PD 36 as a reflected laser beam is set to be “several kilometers×2/speed of light”=several microseconds. Therefore, as illustrated in FIG. 3 as an example, a time of several microseconds is required as a minimum necessary time in order to measure a distance to the subject positioned several kilometers ahead.

Meanwhile, in this embodiment, as illustrated in FIG. 3 as an example, one measurement time is set to be several milliseconds in consideration of a reciprocating time of the laser beam, and the like. However, the reciprocating time of the laser beam varies depending on a distance to the subject, and thus one measurement time may vary in accordance with an assumed distance.

In a case where a distance to the subject is derived on the basis of measured values obtained from several hundred times of measurement in one measurement sequence, the distance measurement control unit 68 analyzes, for example, a histogram of the measured values obtained from several hundred times of measurement to derive a distance to the subject.

As illustrated in FIG. 5 as an example, in a histogram of measured values obtained from several hundred times of measurement in one measurement sequence, the lateral axis represents a distance to a subject, the vertical axis represents the number of times of measurement, and a distance corresponding to a maximum value of the number of times of measurement is derived by the distance measurement control unit 68 as a distance measurement result. Meanwhile, the histogram illustrated in FIG. 5 is just an example, and a histogram may be generated on the basis of a reciprocating time (an elapsed time from the emission of light to the reception of light) of a laser beam, half of the reciprocating time of the laser beam, and the like, instead of the distance to the subject.

As illustrated in FIG. 6 as an example, the main control unit 62 includes a CPU 100, a primary storage unit 102, and a secondary storage unit 104 which are examples of an acquisition unit and a derivation unit according to the technique of this disclosure. The CPU 100 controls the entire distance measurement device 10A. The primary storage unit 102 is a volatile memory which is used as a work area during the execution of various programs, and the like. An example of the primary storage unit 102 is a RAM. The secondary storage unit 104 is a non-volatile memory that stores control programs, various parameters, and the like for controlling the operation of the distance measurement device 10A. An example of the secondary storage unit 104 is an Electrically Erasable Programmable Read Only Memory (EEPROM) and a flash memory. The CPU 100, the primary storage unit 102, and the secondary storage unit 104 are connected to each other through the bus line 84.

The distance measurement device 10A has a three-dimensional coordinate calculation function. The three-dimensional coordinate calculation function refers to a function of calculating designated pixel three-dimensional coordinates to be described later, on the basis of Expression (1) from first designated pixel coordinates to be described later, second designated pixel coordinates to be described later, an imaging position distance to be described later, a focal length of the imaging lens 50, and the dimension of the imaging pixel 60A1.

$\begin{matrix} {{X = {\frac{B}{u_{L} - u_{R}}u_{L}}},{Y = {\frac{B}{u_{L} - u_{R}}v_{L}}},{Z = {\frac{B}{u_{L} - u_{R}}f}}} & (1) \end{matrix}$

Meanwhile, in Expression (1), “u_(L)” denotes an X coordinate of the first designated pixel coordinates. In Expression (1), “v_(L)” denotes a Y coordinate of the first designated pixel coordinates. In Expression (1), “u_(R)” denotes an X coordinate of the second designated pixel coordinates. In Expression (1), “B” denotes the imaging position distance (see FIGS. 7 and 8). In Expression (1), “f” denotes (focal length of the imaging lens 50)/(dimension of the imaging pixel 60A1). In Expression (1), (X, Y, Z) denotes the designated pixel three-dimensional coordinates.

The first designated pixel coordinates are two-dimensional coordinates for specifying a first designated pixel (equivalent to a “designated pixel” according to the technique of this disclosure) which is designated as a pixel corresponding to a position on the real space in a first captured image to be described later. The second designated pixel coordinates are two-dimensional coordinates for specifying a second designated pixel (equivalent to a “designated pixel” according to the technique of this disclosure) which is designated as a pixel corresponding to a position on the real space in a second captured image to be described later. That is, the first designated pixel and the second designated pixel are pixels that are designated as pixels of which the positions on the real space correspond to each other, and are pixels capable of being specified at the positions corresponding to each other in each of the first captured image and the second captured image. The first designated pixel coordinates are two-dimensional coordinates on the first captured image, and the second designated pixel coordinates are two-dimensional coordinates on the second captured image.

The designated pixel three-dimensional coordinates refer to three-dimensional coordinates which are coordinates on the real space which correspond to the first designated pixel coordinates and the second designated pixel coordinates. Meanwhile, the designated pixel three-dimensional coordinates are an example of designated pixel real space coordinates according to the technique of this disclosure.

Here, as illustrated in FIGS. 7 and 8 as examples, the first captured image refers to a captured image obtained by imaging the subject by the imaging device 14 from the first imaging position. In addition, as an example, as illustrated in FIGS. 7 and 8, the second captured image indicates a captured image obtained by imaging a subject, including the subject imaged from the first imaging position, by the imaging device 14 from the second imaging position different from the first imaging position. Meanwhile, the invention is not limited to the first captured image and the second captured image. In this embodiment, for convenience of description, captured images obtained by the imaging of the imaging device 14, inclusive of a still image and a moving image, will be simply referred to as a “captured image” in a case where it is not necessary to give a description by distinguishing between the captured images.

In the example illustrated in FIG. 7, a first measurement position and a second measurement position are shown as positions of the distance measurement unit 12. The first measurement position is an example of a “position corresponding to the first imaging position” according to the technique of this disclosure. The second measurement position is an example of a “position corresponding to the second imaging position” according to the technique of this disclosure. The first measurement position indicates the position of the distance measurement unit 12 in a case where the subject is imaged by the imaging device 14 from the first imaging position in a state where the distance measurement unit 12 is correctly attached to the imaging device 14. The second measurement position refers to the position of the distance measurement unit 12 in a case where the subject is imaged by the imaging device 14 from the second imaging position in a state where the distance measurement unit 12 is correctly attached to the imaging device 14.

The imaging position distance refers to a distance between the first imaging position and the second imaging position. As illustrated in FIG. 8, an example of the imaging position distance is a distance between a principal point O_(L) of the imaging lens 50 of the imaging device 14 at the first imaging position and a principal point O_(R) of the imaging lens 50 of the imaging device 14 at the second imaging position, but the technique of this disclosure is not limited thereto. For example, a distance between the imaging pixel 60A1 positioned in the middle of the imaging element 60 of the imaging device 14 at the first imaging position and the imaging pixel 60A1 positioned in the middle of the imaging element 60 of the imaging device 14 at the second imaging position may be set to be an imaging position distance.

In the example illustrated in FIG. 8, a pixel P_(L) included in the first captured image is a first designated pixel, a pixel P_(R) included in the second captured image is a second designated pixel, and pixels P_(L) and P_(R) are pixels corresponding to a point P of the subject. Accordingly, first designated pixel coordinates (u_(L), v_(L)) which are two-dimensional coordinates of the pixel P_(L) and second designated pixel coordinates (u_(R), v_(R)) which are two-dimensional coordinates of the pixel P_(R) correspond to designated pixel three-dimensional coordinates (X, Y, Z) which are three-dimensional coordinates of the point P. Meanwhile, in Expression (1), “v_(R)” is not used.

Meanwhile, hereinafter, for convenience of description, the first designated pixel and the second designated pixel will be referred to as a “designated pixel” in a case where it is not necessary to give a description by distinguishing between the designated pixels. Further, hereinafter, for convenience of description, the first designated pixel coordinates and the second designated pixel coordinates will be referred to as “designated pixel coordinates” in a case where it is not necessary to give a description by distinguishing between the designated pixel coordinates.

Incidentally, in a case where designated pixel three-dimensional coordinates are calculated on the basis of Expression (1) by the distance measurement device 10A operating a three-dimensional coordinate calculation function, it is preferable to calculate an imaging position distance with a high level of accuracy. This is because “B” which is an imaging position distance is included in Expression (1).

Consequently, in the distance measurement device 10A, as illustrated in FIG. 6 as an example, the secondary storage unit 104 stores an imaging position distance calculation program 106 which is an example of a program according to the technique of this disclosure.

The CPU 100 reads out the imaging position distance calculation program 106 from the secondary storage unit 104 and develops the read-out program to the primary storage unit 102 to execute the imaging position distance calculation program 106.

In addition, as illustrated in FIG. 6 as an example, the secondary storage unit 104 stores a three-dimensional coordinate calculation program 108. The CPU 100 reads out the three-dimensional coordinate calculation program 108 from the secondary storage unit 104 and develops the read-out program to the primary storage unit 102 to execute the three-dimensional coordinate calculation program 108.

The CPU 100 executes the imaging position distance calculation program 106 and the three-dimensional coordinate calculation program 108 to be operated as an acquisition unit 110, a derivation unit 112, and a control unit 114 as illustrated in FIG. 9 as an example.

The acquisition unit 110 acquires a first captured image, a second captured image, and a distance to the subject. The “distance to the subject” as mentioned herein refers to a distance to the subject which is measured on the basis of the laser beam emitted by the distance measurement unit 12 at the first measurement position.

The derivation unit 112 derives an imaging position distance on the basis of designated pixel coordinates, a plurality of pixel coordinates to be described later, emission position real space coordinates to be described later, a focal length of the imaging lens 50, and the dimension of the imaging pixel 60A1. The control unit 114 which is an example of a second control unit according to the technique of this disclosure performs control of displaying derivation results obtained by the derivation unit 112 on the display unit 86.

Here, the plurality of pixel coordinates and the emission position real space coordinates which are used in the derivation unit 112 will be described. Meanwhile, hereinafter, for convenience of description, the “emission position real space coordinates” will also be referred to as “emission position coordinates”. The plurality of pixel coordinates are a plurality of two-dimensional coordinates for specifying a plurality of pixels more than three pixels which are present in a planar region which is the same as an emission position of a laser beam on the real space and correspond to a position on the real space, in each of the first captured image and the second captured image which are acquired by the acquisition unit 110. In addition, the emission position coordinates are three-dimensional coordinates for specifying the emission position of the laser beam on the real space, and are three-dimensional coordinates which are derived on the basis of a distance acquired by the acquisition unit 110.

The emission position coordinates are derived on the basis of the following Expression (2) from a distance L, a half angle of view α, an emission angle β, and a distance between reference points M which are illustrated in FIG. 10 as an example. In Expression (2), (x_(Laser), y_(Laser), z_(Laser)) denotes emission position coordinates.

$\begin{matrix} {{x_{Laser} = \frac{\left( {M - {L\; \cos \; \beta}} \right)}{L\; \tan \; {\alpha sin\beta}}},{y_{Laser} = 0},{z_{Laser} = {L\; \sin \; \beta}}} & (2) \end{matrix}$

In Expression (2), the relation of y_(Laser)=0 is established, but this means that the height of an optical axis L1 is the same as the height of an optical axis L2 in the vertical direction. In a case where the position of a laser beam emitted to the subject is higher than the position of the optical axis L2 in the subject in the vertical direction, y_(Laser) is set to have a positive value. In a case where the position of the laser beam emitted to the subject is lower than the position of the optical axis L2 in the subject in the vertical direction, y_(Laser) is set to have a negative value. Meanwhile, hereinafter, for convenience of description, a description will be given on the assumption that the relation of “y_(Laser)=0” is established.

Here, as illustrated in FIG. 10 as an example, the half angle of view α refers to half an angle of view. The emission angle β refers to an angle at which a laser beam is emitted from the emitting unit 22. The distance between reference points M refers to a distance between a first reference point P1 specified for the imaging device 14 and a second reference point P2 specified for the distance measurement unit 12. An example of the first reference point P1 is a principal point of the imaging lens 50. An example of the second reference point P2 is a point which is set in advance as the starting point of coordinates capable of specifying the position of a three-dimensional space in the distance measurement unit 12. Specifically, an example of the second reference point is one end out of right and left ends of the objective lens 38 in a front view, or one angle, that is, one apex of a housing in a case where the housing (not shown) of the distance measurement unit 12 has a rectangular parallelepiped shape.

The derivation unit 112 derives the direction of a plane specified by a plane equation showing a plane including three-dimensional coordinates on the real space which correspond to a plurality of pixel coordinates, on the basis of the plurality of pixel coordinates, a focal length of the imaging lens 50, and the dimension of the imaging pixel 60A1. The derivation unit 112 decides the plane equation on the basis of the derived direction of the plane and the emission position coordinates, and derives the an imaging position distance on the basis of the decided plane equation, the designated pixel coordinates, the focal length of the imaging lens 50, and the dimension of the imaging pixel 60A1.

Meanwhile, the plane equation which is used for the derivation of the imaging position distance is specified by the following Expression (3). Therefore, the derivation of the “direction of the plane” means that a, b, and c in Expression (3) are derived, and the fixedly deriving of the “plane equation” means that d in Expression (3) is derived to fixedly derive a, b, c, and d of the plane equation.

ax+by+cz+d=0  (3)

Next, operations of portions of the distance measurement device 10A according to the technique of this disclosure will be described.

First, reference will be made to FIGS. 11 and 12 to describe an imaging position distance calculation process realized by the CPU 100 executing the imaging position distance calculation program 106 in a case where the three-dimensional coordinate calculation button 90G is turned on.

Meanwhile, hereinafter, for convenience of description, a description will be given on the assumption that a region including an outer wall surface 121 of an office building 120 is included as a subject in an imaging range 119 of the imaging device 14 of the distance measurement device 10A, as illustrated in FIG. 13 as an example. In addition, a description will be given on the assumption that the outer wall surface 121 is a main subject and is an object to be irradiated with a laser beam.

In addition, the outer wall surface 121 is formed to have a planar shape, and is an example of a planar region according to the technique of this disclosure. In addition, as illustrated in FIG. 13 as an example, a plurality of windows 122 having a quadrilateral shape are provided on the outer wall surface 121. In addition, as illustrated in FIG. 13 as an example, a pattern 124 having a laterally long rectangular shape is drawn below each window 122 on the outer wall surface 121. However, the invention is not limited thereto, and dirt attached to the outer wall surface 121, a crack, or the like may be used.

Meanwhile, in this embodiment, the “planar shape” includes not only a plane but also a planar shape in a range allowing slight irregularities due to the window, a ventilating opening, or the like, and may be, for example, a plane or a planar shape which is recognized as a “planar shape” by visual observation or the existing image analysis technique.

In addition, hereinafter, for convenience of description, a description will be given on the assumption that a distance to the outer wall surface 121 is measured by the distance measurement device 10A by a laser beam being emitted to the outer wall surface 121. In addition, hereinafter, for convenience of description, the position of the distance measurement device 10A in a case where the distance measurement unit 12 is positioned at a first measurement position and the imaging device 14 is positioned at a first imaging position will be referred to as a “first position”. In addition, hereinafter, for convenience of description, the position of the distance measurement device 10A in a case where the distance measurement unit 12 is positioned at a second measurement position and the imaging device 14 is positioned at a second imaging position will be referred to as a “second position”.

In the imaging position distance calculation process illustrated in FIG. 11, first, the acquisition unit 110 determines whether or not the measurement and imaging of a distance have been executed at the first position by the distance measurement device 10A, in step 200. The first position may be a position where the outer wall surface 121 can be irradiated with a laser beam and a region including the outer wall surface 121 can be imaged as a subject.

In a case where the measurement and imaging of a distance have not been executed at the first position by the distance measurement device 10A in step 200, the determination result is negative, and the process proceeds to step 201. In a case where the measurement and imaging of a distance have been executed at the first position by the distance measurement device 10A in step 200, the determination result is positive, and the process proceeds to step 202.

In step 201, the acquisition unit 110 determines whether or not a condition for terminating the imaging position distance calculation process has been satisfied. The condition for terminating the imaging position distance calculation process refers to, for example, a condition that an instruction for terminating the imaging position distance calculation process is received by the touch panel 88 or a condition that the determination result is not positive after the start of the processing of step 200 and a first predetermined time elapses. Meanwhile, the first predetermined time refers to, for example, one minute.

In a case where the condition for terminating the imaging position distance calculation process has not been satisfied in step 201, the determination result is negative, and the process proceeds to step 200. In a case where the condition for terminating the imaging position distance calculation process has been satisfied in step 201, the determination result is positive, and thus the imaging position distance calculation process is terminated.

In step 202, the acquisition unit 110 acquires a distance measured at the first position and a first captured image signal indicating a first captured image obtained by executing imaging at the first position, and then the process proceeds to step 204. Meanwhile, the first captured image is a captured image obtained by performing imaging in a focusing state at the first position.

In step 204, the acquisition unit 110 displays the acquired first captured image indicated by the first captured image signal on the display unit 86 as illustrated in FIG. 14 as an example, and then the process proceeds to step 206.

In step 206, the acquisition unit 110 determines whether or not an attention pixel has been designated by a user from the first captured image through the touch panel 88. Here, the attention pixel is equivalent to the above-described first designated pixel. Meanwhile, the touch panel 88 receives pixel designation information (an example of second pixel designation information according to the technique of this disclosure) for designating two-dimensional coordinates corresponding to a pixel included in the first captured image among two-dimensional coordinates given to the touch panel 88. Accordingly, it is determined in step 206 that an attention pixel has been designated in a case where the pixel designation information is received by the touch panel 88. That is, a pixel corresponding to the two-dimensional coordinates designated in accordance with the pixel designation information is an attention pixel.

In step 206, in a case where an attention pixel has not been designated by the user from the first captured image through the touch panel 88, the determination result is negative, and the process proceeds to step 208. In step 206, in a case where an attention pixel has been designated by the user from the first captured image through the touch panel 88, the determination result is positive, and the process proceeds to step 210.

In step 208, the acquisition unit 110 determines whether or not a condition for terminating the imaging position distance calculation process has been satisfied. In step 208, in a case where the condition for terminating the imaging position distance calculation process has not been satisfied, the determination result is negative, and the process proceeds to step 206. In step 208, in a case where the condition for terminating the imaging position distance calculation process has been satisfied, the determination result is positive, and thus the imaging position distance calculation process is terminated.

In step 210, the acquisition unit 110 acquires attention pixel coordinates for specifying an attention pixel 126 (see FIG. 14) which is designated by the user through the touch panel 88 in the first captured image, and then the process proceeds to step 212. Meanwhile, here, an example of the pixel designated by the user through the touch panel 88 is the attention pixel 126 as illustrated in FIG. 14 as an example. The attention pixel 126 is a pixel at the lower left corner in a front view of an image equivalent to a central window in a second floor of the outer wall surface in the first captured image, as illustrated in FIG. 14 as an example. The central window in the second floor of the outer wall surface indicates a central window 122 in a second floor of the office building 120 among the windows 122 provided on the outer wall surface 121 in the example illustrated in FIG. 13. In addition, the attention pixel coordinates indicate two-dimensional coordinates for specifying the attention pixel 126 in the first captured image.

In step 212, the acquisition unit 110 acquires three characteristic pixel coordinates for specifying three characteristic pixels in an outer wall surface image 128 (a hatched region in the example illustrated in FIG. 15) in the first captured image, and then the process proceeds to step 214. Meanwhile, the “three characteristic pixels” as mentioned herein is an example of “a plurality of pixels” and “a plurality of characteristic pixels” according to the technique of this disclosure.

Here, the outer wall surface image 128 refers to an image showing the outer wall surface 121 (see FIG. 13) in the first captured image. The three characteristic pixels are pixels which are separated from each other by a predetermined number of pixels within the first captured image and are respectively present at three points specified in accordance with a fixed rule by image analysis on the basis of a spatial frequency and the like of an image equivalent to a pattern, a building material, or the like in the outer wall surface image 128. For example, three pixels which show different apexes having a maximum spatial frequency within a circular region, which is fixed by a predetermined radius on the basis of the attention pixel 126, and satisfy fixed conditions are extracted as three characteristic pixels. Meanwhile, the three characteristic pixel coordinates are equivalent to the above-described plurality of pixel coordinates.

In the example illustrated in FIG. 15, the three characteristic pixels are a first pixel 130, a second pixel 132, and a third pixel 134. The first pixel 130 is a pixel at the upper left corner in a front view of an image equivalent to a central window in the second floor of the outer wall surface in the outer wall surface image 128. The second pixel 132 is a pixel at the upper right corner in a front view of the image equivalent to the central window in the second floor of the outer wall surface. The third pixel 134 is a pixel at the lower left corner in a front view of an image equivalent to the pattern 124 close to a lower portion of a central window in a third floor of the outer wall surface. Meanwhile, the central window in the third floor of the outer wall surface refers to a central window 122 in the third floor of the office building 120 among the windows 122 provided on the outer wall surface 121, in the example illustrated in FIG. 13.

In step 214, the derivation unit 112 calculates emission position coordinates from the distance L, the half angle of view α, the emission angle β, and the distance between reference points M on the basis of Expression (2), and then the process proceeds to step 216. The distance L used in the processing of step 214 refers to a distance to the subject which is measured at the first imaging position by the distance measurement device 10A.

In step 216, the derivation unit 112 displays a distance and emission position mark 136 on the display unit 86 so as to be superimposed on the first captured image as illustrated in FIG. 16 as an example, and then the process proceeds to step 218.

The distance displayed by the execution of the processing of step 216 indicates a distance which is measured at the first imaging position by the distance measurement device 10A, that is, the distance L which is used for the calculation of the emission position coordinates in the processing of step 214. In the example illustrated in FIG. 16, a numerical value of “133325.0” corresponds to the distance L which is measured at the first imaging position by the distance measurement device 10A, and the unit is millimeter.

In the example illustrated in FIG. 16, the emission position mark 136 is a mark indicating a position which is specified by the emission position coordinates calculated by the execution of the processing of step 214.

In step 218 illustrated in FIG. 12, the acquisition unit 110 determines whether or not imaging has been executed at the second position by the distance measurement device 10A. The second position is a position of a moving destination of the distance measurement device 10A, and may be a position where the outer wall surface 121 can be irradiated with a laser beam and a region including the outer wall surface 121 can be imaged as a subject.

In step 218, in a case where imaging has not been executed at the second position by the distance measurement device 10A, the determination result is negative, and the process proceeds to step 220. In step 218, in a case where imaging has been executed at the second position by the distance measurement device 10A, the determination result is positive, and the process proceeds to step 222.

In step 220, the acquisition unit 110 determines whether or not a condition for terminating the imaging position distance calculation process has been satisfied. In step 220, in a case where the condition for terminating the imaging position distance calculation process has not been satisfied, the determination result is negative, and the process proceeds to step 218. In step 220, in a case where the condition for terminating the imaging position distance calculation process has been satisfied, the determination result is positive, and thus the imaging position distance calculation process is terminated.

In step 222, the acquisition unit 110 acquires a second captured image signal indicating the second captured image obtained by executing imaging at the second position, and then the process proceeds to step 224. Meanwhile, the second captured image is a captured image obtained by performing imaging in a focusing state at the second position.

In step 224, the acquisition unit 110 displays the acquired second captured image indicated by the second captured image signal on the display unit 86, and then the process proceeds to step 226.

In step 226, the acquisition unit 110 specifies a corresponding attention pixel which is a pixel corresponding to the attention pixel 126 among pixels included in the second captured image and acquires corresponding attention pixel coordinates for specifying the specified corresponding attention pixel, and then the process proceeds to step 228. Meanwhile, here, the corresponding attention pixel coordinates refer to two-dimensional coordinates for specifying the corresponding attention pixel in the second captured image. In addition, the corresponding attention pixel is specified by executing the existing image analysis by using the first and second captured images as objects to be analyzed. Meanwhile, the corresponding attention pixel is equivalent to the above-described second designated pixel, and is uniquely specified from the second captured image by the execution of the processing of step 226 when the attention pixel 126 is specified from the first captured image.

In step 228, the acquisition unit 110 specifies three characteristic pixels in an outer wall surface image corresponding to the outer wall surface image 128 (see FIG. 15) in the second captured image and acquires corresponding characteristic pixel coordinates for specifying the specified three characteristic pixels, and then the process proceeds to step 230. Meanwhile, the “three characteristic pixels” as mentioned herein is an example of “a plurality of pixels” and “a plurality of characteristic pixels” according to the technique of this disclosure. In addition, the corresponding characteristic pixel coordinates refer to two-dimensional coordinates for specifying the three characteristic pixels specified in the second captured image. In addition, the corresponding characteristic pixel coordinates are also two-dimensional coordinates corresponding to the three characteristic pixel coordinates acquired in the processing of step 212 in the second captured image, and are equivalent to the above-described plurality of pixel coordinates. In addition, the three characteristic pixels in the second captured image are specified by executing the existing image analysis by using the first and second captured images as objects to be analyzed, similar to the above-described method of specifying a corresponding attention pixel.

In step 230, the derivation unit 112 derives a, b, and c of the plane equation shown in Expression (3) from the three characteristic pixel coordinates, the corresponding characteristic pixel coordinates, the focal length of the imaging lens 50, and the dimension of the imaging pixel 60A1 to derive the direction of a plane specified by the plane equation.

Here, the three characteristic pixel coordinates are set to be (u_(L1), v_(L1)), (u_(L2), v_(L2)), and (u_(L3), v_(L3)) and the corresponding characteristic pixel coordinates are set to be (u_(R1), v_(R1)), (u_(R2), v_(R2)), and (u_(R3), v_(R3)), first to third characteristic pixel three-dimensional coordinates are specified by the following Expressions (4) to (6). The first characteristic pixel three-dimensional coordinates refer to three-dimensional coordinates corresponding to (u_(L1), v_(L1)) and (u_(R1), v_(R1)). The second characteristic pixel three-dimensional coordinates refer to three-dimensional coordinates corresponding to (u_(L2), v_(L2)) and (u_(R2), v_(R2)). The third characteristic pixel three-dimensional coordinates indicate three-dimensional coordinates corresponding to (u_(L3), v_(L3)) and (u_(R3), v_(R3)). Meanwhile, in Expression (4) to (6), “v_(R1)”, “v_(R2)”, and “v_(R3)” are not used.

$\begin{matrix} {{{first}\mspace{14mu} {characteristic}\mspace{14mu} {pixel}\mspace{14mu} {three}\text{-}{dimensional}\mspace{14mu} {coordinates}\text{:}}\left( {{\frac{B}{u_{L\; 1} - u_{R\; 1}}u_{L\; 1}},{\frac{B}{u_{L\; 1} - u_{R\; 1}}v_{L\; 1}},{\frac{B}{u_{L\; 1} - u_{R\; 1}}f}} \right)} & (4) \\ {{{second}\mspace{14mu} {characteristic}\mspace{14mu} {pixel}\mspace{14mu} {three}\text{-}{dimensional}\mspace{14mu} {coordinates}\text{:}}\left( {{\frac{B}{u_{L\; 2} - u_{R\; 2}}u_{L\; 2}},{\frac{B}{u_{L\; 2} - u_{R\; 2}}v_{L\; 2}},{\frac{B}{u_{L\; 2} - u_{R\; 2}}f}} \right)} & (5) \\ {{{third}\mspace{14mu} {characteristic}\mspace{14mu} {pixel}\mspace{14mu} {three}\text{-}{dimensional}\mspace{14mu} {coordinates}\text{:}}\left( {{\frac{B}{u_{L\; 3} - u_{R\; 3}}u_{L\; 3}},{\frac{B}{u_{L\; 3} - u_{R\; 3}}v_{L\; 3}},{\frac{B}{u_{L\; 3} - u_{R\; 3}}f}} \right)} & (6) \end{matrix}$

In step 230, the derivation unit 112 derives a, b, and c in Expression (3) by optimizing a, b, and c in Expression (3) from three expressions having an equivalence relationship obtained by substituting each of the first to third characteristic pixel three-dimensional coordinates shown in Expressions (4) to (6) for Expression (3). In this manner, the derivation of a, b, and c in Expression (3) means that the direction of the plane specified by the plane equation shown in Expression (3) is derived.

In step 232, the derivation unit 112 decides the plane equation shown in Expression (3) on the basis of the emission position coordinates derived in the processing of step 214, and then the process proceeds to step 234. That is, in step 232, the derivation unit 112 substitutes a, b, and c derived in the processing of step 230 and the emission position coordinates derived in the processing of step 214 for Expression (3) to decide d in Expression (3). Since a, b, and c in Expression (3) are derived in the processing of step 230, the plane equation shown in Expression (3) is decided when d in Expression (3) is decided in the processing of step 232.

In step 234, the derivation unit 112 calculates an imaging position distance on the basis of the attention pixel coordinates, the corresponding attention pixel coordinates, the focal length of the imaging lens 50, the dimension of the imaging pixel 60A1, the plane equation, and Expression (1), and then the process proceeds to step 236.

Here, the attention pixel coordinates used in the processing of step 234 refer to the attention pixel coordinates acquired in the processing of step 210. In addition, the corresponding attention pixel coordinates used in the processing of step 234 refer to the corresponding attention pixel coordinates acquired in the processing of step 226. Further, the plane equation used in step 234 refers to the plane equation decided in step 232.

Accordingly, in step 234, (X, Y, Z) in Expression (1) for which the attention pixel coordinates, the corresponding attention pixel coordinates, the focal length of the imaging lens 50, and the dimension of the imaging pixel 60A1 are substituted is substituted for the plane equation, and thus “B” which is an imaging position distance is derived.

Meanwhile, “B” which is an imaging position distance may be derived on the basis of the characteristic pixel three-dimensional coordinates and the plane equation decided in step 232. That is, in this case, “B” which is an imaging position distance is derived by the characteristic pixel three-dimensional coordinates being substituted for the plane equation decided in step 232. The “characteristic pixel three-dimensional coordinates” as mentioned herein refers to, for example, the first characteristic pixel three-dimensional coordinates. However, the invention is not limited thereto, and the characteristic pixel three-dimensional coordinates may be the second characteristic pixel three-dimensional coordinates or the third characteristic pixel three-dimensional coordinates.

In step 236, the control unit 114 displays the imaging position distance calculated in the processing of step 234 on the display unit 86 so as to be superimposed on the second captured image, as illustrated in FIG. 17 as an example. In step 236, the control unit 114 stores the imaging position distance calculated in the processing of step 234 in a predetermined storage region, and then terminates the imaging position distance calculation process. Meanwhile, an example of the predetermined storage region is a storage region of the primary storage unit 102 or a storage region of the secondary storage unit 104.

Meanwhile, in the example illustrated in FIG. 17, a numerical value of “144656.1” corresponds to the imaging position distance calculated in the processing of step 234, and the unit is millimeter.

Next, reference will be made to FIG. 18 to describe the three-dimensional coordinate calculation process realized by the CPU 100 executing the three-dimensional coordinate calculation program 108 in a case where the three-dimensional coordinate calculation button 90G is turned on.

In the three-dimensional coordinate calculation process illustrated in FIG. 18, first, in step 250, the derivation unit 112 determines whether or not an imaging position distance has been already calculated in the processing of step 234 included in the imaging position distance calculation process. In step 250, in a case where an imaging position distance has not been calculated in the processing of step 234 included in the imaging position distance calculation process, the determination result is negative, and the process proceeds to step 258. In step 250, in a case where an imaging position distance has been already calculated in the processing of step 234 included in the imaging position distance calculation process, the determination result is positive, and the process proceeds to step 252.

In step 252, the derivation unit 112 determines whether or not a condition (hereinafter, referred to as a “calculation start condition”) for starting the calculation of designated pixel three-dimensional coordinates has been satisfied. An example of the calculation start condition is a condition that an instruction for starting the calculation of the designated pixel three-dimensional coordinates is received by the touch panel 88, or a condition that the imaging position distance is displayed on the display unit 86.

In step 252, in a case where the calculation start condition has not been satisfied, the determination result is negative, and the process proceeds to step 258. In step 252, in a case where the calculation start condition has been satisfied, the determination result is positive, and the process proceeds to step 254.

In step 254, the derivation unit 112 calculates designated pixel three-dimensional coordinates on the basis of the attention pixel coordinates, the corresponding attention pixel coordinates, the imaging position distance, the focal length of the imaging lens 50, the dimension of the imaging pixel 60A1, and Expression (1), and then the process proceeds to step 256.

Here, the attention pixel coordinates used in the processing of step 254 refer to the attention pixel coordinates acquired in the processing of step 210 included in the imaging position distance calculation process. In addition, the corresponding attention pixel coordinates used in the processing of step 254 refer to the corresponding attention pixel coordinates acquired in the processing of step 226 included in the imaging position distance calculation process. In addition, the imaging position distance used in the processing of step 254 indicates the imaging position distance derived in the processing of step 234 included in the imaging position distance calculation process.

Accordingly, in step 254, the designated pixel three-dimensional coordinates are calculated by substituting the attention pixel coordinates, the corresponding attention pixel coordinates, the imaging position distance, the focal length of the imaging lens 50, and the dimension of the imaging pixel 60A1 for Expression (1).

In step 256, the control unit 114 displays the designated pixel three-dimensional coordinates calculated in the processing of step 254 on the display unit 86 so as to be superimposed on the second captured image, as illustrated in FIG. 19 as an example. In step 256, the control unit 114 stores the designated pixel three-dimensional coordinates calculated in the processing of step 254 in a predetermined storage region, and then terminates the three-dimensional coordinate calculation process. Meanwhile, an example of the predetermined storage region is a storage region of the primary storage unit 102 and a storage region of the secondary storage unit 104.

Meanwhile, in the example illustrated in FIG. 19, (20161, 50134, 136892) corresponds to the designated pixel three-dimensional coordinates calculated in the processing of step 254. In the example illustrated in FIG. 19, the designated pixel three-dimensional coordinates are displayed in proximity to the attention pixel 126. Meanwhile, the attention pixel 126 may be emphatically displayed so as to be distinguishable from other pixels.

In step 258, the derivation unit 112 determines whether or not a condition for terminating the three-dimensional coordinate calculation process has been satisfied. An example of the condition for terminating the three-dimensional coordinate calculation process is a condition that an instruction for terminating the three-dimensional coordinate calculation process is received by the touch panel 88. Another example of the condition for terminating the three-dimensional coordinate calculation process is a condition that the determination result is not positive in step 250 after the determination result is negative in step 250 and a second predetermined time elapses, and the like. Meanwhile, the second predetermined time refers to, for example, 30 minutes.

In step 258, in a case where the condition for terminating the three-dimensional coordinate calculation process has not been satisfied, the determination result is negative, and the process proceeds to step 250. In step 258, in a case where the condition for terminating the three-dimensional coordinate calculation process has been satisfied, the determination result is positive, and thus the three-dimensional coordinate calculation process is terminated.

As described above, in the distance measurement device 10A, the first captured image, the second captured image, and the distance to the subject are acquired by the acquisition unit 110. In addition, the attention pixel 126 is designated in the first captured image by the user through the touch panel 88, and attention pixel coordinates are acquired by the acquisition unit 110 (step 210). In addition, corresponding attention pixel coordinates are acquired by the acquisition unit 110 (step 226). In addition, three characteristic pixel coordinates are acquired by the acquisition unit 110 (step 212). In addition, corresponding characteristic pixel coordinates are acquired by the acquisition unit 110 (step 228). In addition, the emission position coordinates are calculated by the derivation unit 112 (step 214). The imaging position distance is derived by the derivation unit 112 on the basis of the attention pixel coordinates, the corresponding attention pixel coordinates, the three characteristic pixel coordinates, corresponding characteristic pixel coordinates, the emission position coordinates, the focal length of the imaging lens 50, and the dimension of the imaging pixel 60A1.

Therefore, according to the distance measurement device 10A, even when a characteristic location capable of being specified is not irradiated with a laser beam, it is possible to derive the imaging position distance on the basis of the first captured image and the second captured image which are obtained by respectively imaging the subject from the first imaging position and the second imaging position.

In the distance measurement device 10A, designated pixel three-dimensional coordinates are calculated on the basis of the imaging position distance calculated in the imaging position distance calculation process (see FIG. 18). Therefore, according to the distance measurement device 10A, even when a characteristic location capable of being specified is not irradiated with a laser beam, the designated pixel three-dimensional coordinates can be derived.

In the distance measurement device 10A, the designated pixel three-dimensional coordinates are specified on the basis of the attention pixel coordinates, the corresponding attention pixel coordinates, the imaging position distance, the focal length of the imaging lens 50, and the dimension of the imaging pixel 60A1 (see Expression (1)). Therefore, according to the distance measurement device 10A, it is possible to derive the designated pixel three-dimensional coordinates with a high level of accuracy, as compared to a case where the designated pixel three-dimensional coordinates are not specified on the basis of the attention pixel coordinates, the corresponding attention pixel coordinates, the imaging position distance, the focal length of the imaging lens 50, and the dimension of the imaging pixel 60A1.

In the distance measurement device 10A, the direction of a plane specified by the plane equation shown in Expression (3) is derived by the derivation unit 112 on the basis of the three characteristic pixel coordinates, the corresponding characteristic pixel coordinates, the focal length of the imaging lens 50, and the dimension of the imaging pixel 60A1 (step 230). In addition, the plane equation shown in Expression (3) is decided by the derivation unit 112 on the basis of the direction of the plane and the emission position coordinates calculated in the processing of step 214 (step 232). An imaging position distance is calculated by the derivation unit 112 on the basis of the decided plane equation, the attention pixel coordinates, the focal length of the imaging lens 50, and the dimension of the imaging pixel 60A1 (step 234). Therefore, according to the distance measurement device 10A, it is possible to derive the imaging position distance with a high level of accuracy, as compared to a case where the imaging position distance is derived without using the plane equation when a characteristic location capable of being specified is not irradiated with a laser beam.

In the distance measurement device 10A, three characteristic pixel coordinates are acquired by the acquisition unit 110 (step 212), and corresponding characteristic pixel coordinates are acquired by the acquisition unit 110 (step 228). An imaging position distance is calculated by the derivation unit 112 on the basis of the attention pixel coordinates, the corresponding attention pixel coordinates, the three characteristic pixel coordinates, the corresponding characteristic pixel coordinates, the emission position coordinates, the focal length of the imaging lens 50, and the dimension of the imaging pixel 60A1 (steps 230 to 234). Therefore, according to the distance measurement device 10A, it is possible to derive the imaging position distance on the basis of the three characteristic pixel coordinates and the corresponding characteristic pixel coordinates with a small number of operations, as compared to a case where the user designates three characteristic pixels in acquiring the three characteristic pixel coordinates and the corresponding characteristic pixel coordinates.

In the distance measurement device 10A, pixel designation information is received by the touch panel 88, a pixel designated on the basis of the received pixel designation information is set to be the attention pixel 126, and attention pixel coordinates are acquired by the acquisition unit 110 (step 210). In addition, a corresponding attention pixel which is a pixel corresponding to the attention pixel 126 is specified by the acquisition unit 110. Corresponding attention pixel coordinates for specifying the corresponding attention pixel are acquired by the acquisition unit 110 (step 226). Therefore, according to the distance measurement device 10A, it is possible to rapidly determine a designated pixel related to both the first captured image and the second captured image, as compared to a case where the designated pixel related to both the first captured image and the second captured image is designated by the user.

In addition, the distance measurement device 10A includes the distance measurement unit 12 and the distance measurement control unit 68, and a distance to the subject which is measured by the distance measurement unit 12 and the distance measurement control unit 68 is acquired by the acquisition unit 110. Therefore, according to the distance measurement device 10A, it is possible to easily acquire a distance to the subject which is used for the derivation of emission position coordinates, as compared to a case where the distance measurement device does not include the distance measurement unit 12 and the distance measurement control unit 68.

In addition, the distance measurement device 10A includes the imaging device 14, and the first captured image and the second captured image which are obtained by imaging the subject by the imaging device 14 are acquired by the acquisition unit 110. Therefore, according to the distance measurement device 10A, it is possible to easily acquire the first captured image and the second captured image which are used to obtain the attention pixel coordinates, the three characteristic pixel coordinates, the corresponding attention pixel coordinates, and the corresponding characteristic pixel coordinates, as compared to a case where the distance measurement device does not include the imaging device 14.

Further, in the distance measurement device 10A, derivation results of the derivation unit 112 are displayed by the display unit 86. Therefore, according to the distance measurement device 10A, it is possible to make the user easily recognize the derivation results of the derivation unit 112, as compared to a case where the derivation results of the derivation unit 112 are not displayed by the display unit 86.

Meanwhile, in the first embodiment, the three characteristic pixel coordinates are described, but the technique of this disclosure is not limited thereto. For example, two-dimensional coordinates for specifying each of a predetermined number of pixels more than four characteristic pixels may be adopted instead of the three characteristic pixel coordinates.

In the first embodiment, a description has been given of a case where the attention pixel coordinates are acquired from coordinates on the first captured image and the corresponding attention pixel coordinates are acquired from coordinates on the second captured image, but the technique of this disclosure is not limited thereto. For example, the attention pixel coordinates may be acquired from the coordinates on the second captured image, and the corresponding attention pixel coordinates may be acquired from the coordinates on the first captured image.

In the first embodiment, a description has been given of a case where the three characteristic pixel coordinates are acquired from coordinates on the first captured image and the corresponding characteristic pixel coordinates are acquired from coordinates on the second captured image, but the technique of this disclosure is not limited thereto. For example, the three characteristic pixel coordinates may be acquired from the coordinates on the second captured image, and the corresponding characteristic pixel coordinates may be acquired from the coordinates on the first captured image.

In the first embodiment, a description has been given of a case where two-dimensional coordinates for specifying each of the first pixel 130, the second pixel 132, and the third pixel 134 are acquired by the acquisition unit 110 as three characteristic pixel coordinates, but the technique of this disclosure is not limited thereto. For example, as illustrated in FIG. 20, two-dimensional coordinates for specifying each of a first pixel 130A, a second pixel 132A, and a third pixel 134A may be acquired by the acquisition unit 110. The first pixel 130A, the second pixel 132A, and the third pixel 134A are three pixels for maximizing an area surrounded in the outer wall surface image 128. Meanwhile, the invention is not limited to the three pixels, and the pixels may be a predetermined number of pixels more than three pixels for maximizing an area surrounded in the outer wall surface image 128.

In this manner, in the example illustrated in FIG. 20, three pixels for maximizing an area surrounded in the outer wall surface image 128 are specified as three characteristic pixels, and two-dimensional coordinates related to the specified the three pixels are acquired by the acquisition unit 110 as three characteristic pixel coordinates. In addition, corresponding characteristic pixel coordinates corresponding to the three characteristic pixel coordinates are also acquired by the acquisition unit 110. Therefore, according to the distance measurement device 10A, it is possible to derive an imaging position distance with a high level of accuracy, as compared to a case where three characteristic pixel coordinates for specifying a plurality of pixels not for maximizing an area surrounded and corresponding characteristic pixel coordinates are acquired as three characteristic pixels.

In the first embodiment, a description has been given of a case where the imaging position distance derivation process is realized when the three-dimensional coordinate calculation button 90G is turned on, but the invention is not limited thereto. For example, the imaging position distance derivation process may be executed in a case where the imaging position distance calculation button 90F is turned on. The imaging position distance derivation process described in the first embodiment is an example in a case where the derivation of three-dimensional coordinates is set to be the final purpose.

For this reason, attention pixel coordinates and corresponding pixel coordinates which are required in the derivation of three-dimensional coordinates are acquired through the imaging position distance derivation process. However, in a case where only the derivation of an imaging position distance is a purpose, it is not necessary to acquire attention pixel coordinates and corresponding pixel coordinates in the imaging position distance derivation process. Accordingly, the CPU 100 may derive the imaging position distance without acquiring the attention pixel coordinates and the corresponding attention pixel coordinates in a case where the imaging position distance calculation button 90F is turned on, and may then acquire the attention pixel coordinates and the corresponding attention pixel coordinates in a case where the three-dimensional coordinate calculation button 90G is turned on. In this case, the CPU 100 may acquire the attention pixel coordinates and the corresponding attention pixel coordinates, for example, between the processing of step 252 and the processing of step 254 of the three-dimensional coordinates derivation process illustrated in FIG. 34, and may use the acquired attention pixel coordinates and corresponding attention pixel coordinates in the processing of step 254.

Second Embodiment

In the first embodiment, a description has been given of a case where three characteristic pixel coordinates are acquired with respect to the entire outer wall surface image 128. However, in a second embodiment, a description will be given of a case where three characteristic pixel coordinates are acquired with respect to a portion of the outer wall surface image 128. Meanwhile, in the second embodiment, the same components as those described in the first embodiment will be denoted by the same reference numerals and signs, and a description thereof will be omitted.

A distance measurement device 10B according to the second embodiment is different from the distance measurement device 10A as illustrated in FIG. 6 as an example in that an imaging position distance calculation program 150 is stored in a secondary storage unit 104 instead of the imaging position distance calculation program 106.

The CPU 100 executes the imaging position distance calculation program 150 and a three-dimensional coordinate calculation program 108 to be operated as an acquisition unit 154, a derivation unit 112, and a control unit 156 which is an example of each of a first control unit and a second control unit according to the technique of this disclosure (see FIG. 9).

The acquisition unit 154 corresponds to the acquisition unit 110 described in the first embodiment, and the control unit 156 corresponds to the control unit 114 described in the first embodiment. Meanwhile, in the second embodiment, for convenience of description, different portions from the acquisition unit 110 and the control unit 114 described in the first embodiment will be described with regard to the acquisition unit 154 and the control unit 156.

The control unit 156 performs control of displaying a first captured image on a display unit 86 and displaying an outer wall surface image 128, which is an example of a corresponding region according to the technique of this disclosure, within a display region so as to be distinguishable from the other regions. A touch panel 88 receives region designation information for designating a coordinate acquisition target region 158 (see FIG. 22) in a state where the outer wall surface image 128 is displayed on the display unit 86. Here, the coordinate acquisition target region 158 refers to a partial closed region in the outer wall surface image 128. The region designation information refers to information for designating the coordinate acquisition target region 158.

The acquisition unit 154 acquires three characteristic pixel coordinates from the coordinate acquisition target region 158 designated in accordance with the region designation information received by the touch panel 88.

Next, an imaging position distance calculation process realized by the CPU 100 executing the imaging position distance calculation program 150 will be described with reference to FIG. 21, as the operation of portions of the distance measurement device 10B according to the technique of this disclosure. Meanwhile, the same steps as those in the flowchart illustrated in FIG. 11 will be denoted by the same step numbers, and a description thereof will be omitted.

The flowchart illustrated in FIG. 21 is different from the flowchart illustrated in FIG. 11 in that steps 300 to 312 are provided instead of step 212.

In step 300 illustrated in FIG. 21, the control unit 156 specifies the outer wall surface image 128 (see FIG. 15) from the first captured image, and then the process proceeds to step 302.

In step 302, the control unit 156 emphatically displays the outer wall surface image 128 specified in the processing of step 300 on the display unit 86 so as to be distinguishable from the other regions within the display region of the first captured image, and then the process proceeds to step 304.

In step 304, the acquisition unit 154 determines whether or not the region designation information has been received by the touch panel 88 and the coordinate acquisition target region 158 has been designated in accordance with the received region designation information.

In step 304, in a case where the coordinate acquisition target region 158 has not been designated in accordance with the region designation information, the determination result is negative, and the process proceeds to step 306. In step 304, in a case where the coordinate acquisition target region 158 has been designated in accordance with the region designation information, the determination result is positive, and the process proceeds to step 308.

In step 306, the acquisition unit 154 determines whether or not a condition for terminating the imaging position distance calculation process has been satisfied. In step 306, in a case where the condition for terminating the imaging position distance calculation process has not been satisfied, the determination result is negative, and the process proceeds to step 304. In step 306, in a case where the condition for terminating the imaging position distance calculation process has been satisfied, the determination result is positive, and thus the imaging position distance calculation process is terminated.

In step 308, the acquisition unit 154 determines whether or not the coordinate acquisition target region 158 designated in accordance with the region designation information received by the touch panel 88 includes the three characteristic pixels described in the first embodiment.

As illustrated in FIG. 22 as an example, in a case where the coordinate acquisition target region 158 has been designated in accordance with the region designation information received by the touch panel 88, the coordinate acquisition target region 158 includes a pattern image 160 showing a pattern 124 (see FIG. 13).

In the example illustrated in FIG. 23, the coordinate acquisition target region 158 includes a first pixel 162, a second pixel 164, and a third pixel 166 as three characteristic pixels. In the example illustrated in FIG. 23, the first pixel 162 is a pixel at the upper left corner in a front view of the pattern image 160, the second pixel 164 is a pixel at the lower left corner in a front view of the pattern image 160, and the third pixel 166 is a pixel at the lower right corner in a front view of the pattern image 160.

In step 308, in a case where the coordinate acquisition target region 158 has been designated in accordance with the region designation information received by the touch panel 88 does not include three characteristic pixels, the determination result is negative, and the process proceeds to step 310. In step 308, in a case where the coordinate acquisition target region 158 has been designated in accordance with the region designation information received by the touch panel 88 includes three characteristic pixels, the determination result is positive, and the process proceeds to step 312. Meanwhile, the case where the determination result is positive in step 308 refers to a case where a region including the pattern image 160 has been designated in accordance with the region designation information received by the touch panel 88, for example, as illustrated in FIG. 22.

In step 310, the control unit 156 displays a re-designation message on the display unit 86 so as to be superimposed on a predetermined region of the first captured image, and then the process proceeds to step 304. The re-designation message refers to, for example, a message of “please designate a closed region including a characteristic pattern, a building material, and the like”. Meanwhile, here, a case where the re-designation message is visibly displayed has been described. However, the technique of this disclosure is not limited thereto, and audible display such as the output of a sound using a sound reproducing device (not shown) or permanent visible display such as the output of printed matter using a printer may be performed instead of the visible display or may be performed in combination.

In step 312, the acquisition unit 154 acquires three characteristic pixel coordinates for specifying three characteristic pixels in the coordinate acquisition target region designated in accordance with the region designation information received by the touch panel 88, and then the process proceeds to step 214. Meanwhile, in the example illustrated in FIG. 23, the processing of step 312 is executed, and thus two-dimensional coordinates for specifying each of the first pixel 162, the second pixel 164, and the third pixel 166 are acquired by the acquisition unit 154 as three characteristic pixel coordinates.

As described above, in the distance measurement device 10B, the outer wall surface image 128 is displayed on the display unit 86 so as to be distinguishable from the other regions in the first captured image. In addition, the region designation information is received by the touch panel 88, and a coordinate acquisition target region which is a portion of the outer wall surface image 128 is designated in accordance with the received region designation information. In a case where the coordinate acquisition target region includes three characteristic pixels, the three characteristic pixel coordinates for specifying the three characteristic pixels are acquired by the acquisition unit 154 (step 312), and corresponding characteristic pixel coordinates corresponding to the three characteristic pixel coordinates are also acquired (step 228). Therefore, according to the distance measurement device 10B, it is possible to acquire the three characteristic pixel coordinates and the corresponding characteristic pixel coordinates with a small load, as compared to a case where the three characteristic pixel coordinates and the corresponding characteristic pixel coordinates are acquired with respect to the entire outer wall surface image 128.

Third Embodiment

In the above-described embodiments, a description has been given of a case where three characteristic pixels are searched for and specified within a specific image through-image analysis. However, in a third embodiment, a description will be given of a case where three characteristic pixels are designated in accordance with an operation to the touch panel 88. Meanwhile, in the third embodiment, the same components as those described in the above-described embodiments will be denoted by the same reference numerals and signs, and a description thereof will be omitted.

A distance measurement device 10C according to the third embodiment is different from the distance measurement device 10A in that an imaging position distance calculation program 168 is stored in a secondary storage unit 104 instead of the imaging position distance calculation program 106.

A CPU 100 executes the imaging position distance calculation program 168 and a three-dimensional coordinate calculation program 108 to be operated as an acquisition unit 172, a derivation unit 174, and a control unit 176 as illustrated in FIG. 9 as an example.

The acquisition unit 172 corresponds to the acquisition unit 110 (154) described in the above-described embodiments, the derivation unit 174 corresponds to the derivation unit 112 described in the first embodiment, and the control unit 176 corresponds to the control unit 114 (156) described in the above-described embodiments. Meanwhile, in the third embodiment, for convenience of description, different portions from the acquisition unit 110 (154), the derivation unit 112, and the control unit 114 (156) described in the above-described embodiments will be described with regard to the acquisition unit 172, the derivation unit 174, and the control unit 176.

The touch panel 88 receives the pixel designation information (first pixel designation information according to the technique of this disclosure) which is described in the first embodiment in a case where each of a first captured image and a second captured image is displayed on a display unit 86. In addition, the touch panel 88 also receives the pixel designation information (first pixel designation information according to the technique of this disclosure) which is described in the first embodiment even when the second captured image is displayed on the display unit 86.

In a case where the first captured image is displayed on the display unit 86, the acquisition unit 110 acquires first characteristic pixel coordinates which are two-dimensional coordinates for specifying each of three characteristic pixels designated in accordance with the pixel designation information received by the touch panel 88. The first characteristic pixel coordinates are two-dimensional coordinates corresponding to the three characteristic pixel coordinates described in the first embodiment.

In a case where the second captured image is displayed on the display unit 86, the acquisition unit 110 acquires second characteristic pixel coordinates which are two-dimensional coordinates for specifying each of three characteristic pixels designated in accordance with the pixel designation information received by the touch panel 88. The second characteristic pixel coordinates are two-dimensional coordinates corresponding to the corresponding characteristic pixel coordinates described in the first embodiment.

The derivation unit 174 derives an imaging position distance on the basis of attention pixel coordinates, corresponding attention pixel coordinates, first characteristic pixel coordinates, second characteristic pixel coordinates, emission position coordinates, a focal length of an imaging lens 50, and a dimension of an imaging pixel 60A1.

Next, an imaging position distance calculation process realized by the CPU 100 executing an imaging position distance calculation program 150 will be described with reference to FIGS. 24 and 25, as the operation of portions of the distance measurement device 10C according to the technique of this disclosure. Meanwhile, the same steps as those in the flowchart illustrated in FIGS. 12 and 21 will be denoted by the same step numbers, and a description thereof will be omitted.

The flowchart illustrated in FIG. 24 is different from the flowchart illustrated in FIG. 21 in that step 349 is provided instead of step 304. In addition, the flowchart illustrated in FIG. 24 is different from the flowchart illustrated in FIG. 21 in that steps 350 and 352 are provided instead of step 308. In addition, the flowchart illustrated in FIG. 24 is different from the flowchart illustrated in FIG. 21 in that step 353 is provided instead of step 310. In addition, the flowchart illustrated in FIG. 24 is different from the flowchart illustrated in FIG. 21 in that step 354 is provided instead of step 312. Further, the flowchart illustrated in FIG. 25 is different from the flowchart illustrated in FIG. 12 in that steps 356 to 372 are provided instead of steps 228 and 230.

In step 349, the acquisition unit 154 determines whether or not the region designation information has been received by the touch panel 88 and a first coordinate acquisition target region 178 (see FIG. 22) has been designated in accordance with the received region designation information. Meanwhile, the first coordinate acquisition target region 178 is a region corresponding to the coordinate acquisition target region described in the second embodiment.

In step 349, in a case where the first coordinate acquisition target region 178 has not been designated in accordance with the region designation information, the determination result is negative, and the process proceeds to step 306. In step 349, in a case where the first coordinate acquisition target region 178 has been designated in accordance with the region designation information, the determination result is positive, and the process proceeds to step 350.

In step 350, the control unit 176 emphatically displays the first coordinate acquisition target region 178, which is designated in accordance with the region designation information received by the touch panel, 88 on the display unit 86 so as to be distinguishable from the other regions within the display region of the first captured image, and then the process proceeds to step 352.

In step 352, the acquisition unit 172 determines whether or not three characteristic pixels have been designated in accordance with the pixel designation information received by the touch panel 88.

As illustrated in FIG. 22 as an example, in a case where the first coordinate acquisition target region 178 has been designated in accordance with the region designation information received by the touch panel 88, the first coordinate acquisition target region 178 includes a pattern image 160. In this case, the three characteristic pixels refer to a first pixel 162, a second pixel 164, and a third pixel 166 which are pixels positioned at three corners of the pattern image 160, as illustrated in FIG. 23 as an example.

In step 352, in a case where the three characteristic pixels have not been designated in accordance with the pixel designation information received by the touch panel 88, the determination result is negative, and the process proceeds to step 353. In step 352, in a case where the three characteristic pixels have been designated in accordance with the pixel designation information received by the touch panel 88, the determination result is positive, and the process proceeds to step 354.

In step 353, the control unit 176 displays a re-designation message on the display unit 86 so as to be superimposed on a predetermined region of the first captured image, and then the process proceeds to step 349. The re-designation message according to the third embodiment refers to, for example, a message of “please designate a closed region including a characteristic pattern, a building material, and the like and then designate three characteristic pixels”.

In step 354, the acquisition unit 172 acquires first characteristic pixel coordinates for specifying the three characteristic pixels designated in accordance with the pixel designation information received by the touch panel 88, and then the process proceeds to step 214. Meanwhile, in the example illustrated in FIG. 23, the processing of step 354 is executed, and thus two-dimensional coordinates for specifying each of the first pixel 162, the second pixel 164, and the third pixel 166 are acquired by the acquisition unit 172 as the first characteristic pixel coordinates.

In step 356 illustrated in FIG. 25, the control unit 176 specifies a corresponding outer wall surface image which is an outer wall surface image corresponding to the outer wall surface image 128 from the second captured image, and then the process proceeds to step 358.

In step 358, the control unit 176 emphatically displays the corresponding outer wall surface image specified in the processing of step 356 on the display unit 86 so as to be distinguishable from the other regions within a display region of the second captured image, and then the process proceeds to step 360.

In step 360, the acquisition unit 172 determines whether or not the region designation information has been received by the touch panel 88 and a second coordinate acquisition target region has been designated in accordance with the received region designation information. Meanwhile, the second coordinate acquisition target region is a region designated by the user through the touch panel 88 as a region corresponding to the first coordinate acquisition target region 178 (see FIG. 23) in the second captured image.

In step 360, in a case where the second coordinate acquisition target region has not been designated in accordance with the region designation information, the determination result is negative, and the process proceeds to step 362. In step 360, in a case where the second coordinate acquisition target region has been designated in accordance with the region designation information, the determination result is positive, and the process proceeds to step 364.

In step 362, the acquisition unit 172 determines whether or not a condition for terminating the imaging position distance calculation process has been satisfied. In step 362, in a case where the condition for terminating the imaging position distance calculation process has not been satisfied, the determination result is negative, and the process proceeds to step 360. In step 362, in a case where the condition for terminating the imaging position distance calculation process has been satisfied, the determination result is positive, and thus the imaging position distance calculation process is terminated.

In step 364, the control unit 176 emphatically displays the second coordinate acquisition target region, which is designated in accordance with the region designation information received by the touch panel 88, on the display unit 86 so as to be distinguishable from the other regions within the display region of the second captured image, and then the process proceeds to step 366.

In step 366, the acquisition unit 172 determines whether or not three characteristic pixels have been designated in accordance with the pixel designation information received by the touch panel 88.

In a case where the second coordinate acquisition target region has been designated in accordance with the region designation information received by the touch panel 88, the second coordinate acquisition target region includes a pattern image corresponding to the pattern image 160. In this case, the three characteristic pixels are pixels positioned at three corners of the pattern image corresponding to the pattern image 160 in the second captured image. The pixels positioned at the three corners of the pattern image corresponding to the pattern image 160 refer to, for example, a pixel corresponding to the first pixel 162, a pixel corresponding to the second pixel 164, and a pixel corresponding to the third pixel in the second captured image.

In step 366, in a case where the three characteristic pixels have not been designated in accordance with the pixel designation information received by the touch panel 88, the determination result is negative, and the process proceeds to step 368. In step 366, in a case where the three characteristic pixels have been designated in accordance with the pixel designation information received by the touch panel 88, the determination result is positive, and the process proceeds to step 370.

In step 368, the control unit 176 displays the re-designation message according to the third embodiment on the display unit 86 so as to be superimposed on a predetermined region of the second captured image, and then the process proceeds to step 360.

In step 370, the acquisition unit 172 acquires second characteristic pixel coordinates for specifying the three characteristic pixels designated in accordance with the pixel designation information received by the touch panel 88, and then the process proceeds to step 372. Meanwhile, in step 370, two-dimensional coordinates for specifying each of the pixel corresponding to the first pixel 162, the pixel corresponding to the second pixel 164, and the pixel corresponding to the third pixel 166 are acquired by the acquisition unit 172 as the second characteristic pixel coordinates, for example, in the second captured image.

In step 372, the derivation unit 174 derives a, b, and c of the plane equation shown in Expression (3) from the first characteristic pixel coordinates, the second characteristic pixel coordinates, the focal length of the imaging lens 50, and the dimension of the imaging pixel 60A1 to derive the direction of a plane specified by the plane equation. Meanwhile, the first characteristic pixel coordinates used in the processing of step 372 are the first characteristic pixel coordinates acquired in the processing of step 354, and are equivalent to the three characteristic pixel coordinates described in the first embodiment. In addition, the second characteristic pixel coordinates used in the processing of step 372 are the second characteristic pixel coordinates acquired in the processing of step 370, and are equivalent to the corresponding characteristic pixel coordinates described in the first embodiment.

As described above, in the distance measurement device 10C, the three characteristic pixels are designated through the touch panel 88 in the first captured image, and the first characteristic pixel coordinates for specifying the designated three characteristic pixels are acquired by the acquisition unit 172 (step 354). In addition, the three characteristic pixels corresponding to the three characteristic pixels of the first captured image are designated through the touch panel 88 in the second captured image (step 366: Y). In addition, the second characteristic pixel coordinates for specifying the three characteristic pixels designated through the touch panel 88 in the second captured image are acquired by the acquisition unit 172 (step 370). An imaging position distance is calculated by the derivation unit 174 on the basis of the attention pixel coordinates, the corresponding attention pixel coordinates, the first characteristic pixel coordinates, the second characteristic pixel coordinates, the focus position coordinates, the focal length of the imaging lens 50, and the dimension of the imaging pixel 60A1. Therefore, according to the distance measurement device 10C, it is possible to calculate the imaging position distance on the basis of the first characteristic pixel coordinates and the second characteristic pixel coordinates which are acquired in accordance with the user's intention.

Fourth Embodiment

In the above-described embodiments, a description has been given of a case where distance measurement is performed at a first position out of the first position and a second position, but a description will be given of a case where distance measurement is also performed at the second position in a fourth embodiment. Meanwhile, in the fourth embodiment, the same components as those described in the above-described embodiments will be denoted by the same reference numerals and signs, and a description thereof will be omitted.

A distance measurement device 10D according to the fourth embodiment is different from the distance measurement device 10A in that an imaging position distance calculation program 180 is stored in a secondary storage unit 104 instead of an imaging position distance calculation program 106. In addition, the distance measurement device 10D is different from the distance measurement device 10A in that a three-dimensional coordinate calculation program 181 is stored in the secondary storage unit 104 instead of a three-dimensional coordinate calculation program 108.

A CPU 100 executes the imaging position distance calculation program 180 and a three-dimensional coordinate calculation program 181 to be operated as an acquisition unit 182, a derivation unit 184, and a control unit 185 as illustrated in FIG. 9 as an example.

The acquisition unit 182 corresponds to the acquisition unit 154 described in the second embodiment, the derivation unit 184 corresponds to the derivation unit 112 described in the first embodiment, and the control unit 185 corresponds to the control unit 156 described in the second embodiment. Meanwhile, in the fourth embodiment, for convenience of description, different portions from the acquisition unit 154 described in the second embodiment will be described with regard to the acquisition unit 182. In the fourth embodiment, for convenience of description, different portions from the derivation unit 112 described in the first embodiment will be described with regard to the derivation unit 184. Further, in the fourth embodiment, for convenience of description, different portions from the control unit 156 described in the second embodiment will be described with regard to the control unit 185.

The acquisition unit 182 further acquires a reference distance, as compared to the acquisition unit 154. The “reference distance” as mentioned herein refers to a distance which is measured on the basis of a laser beam emitted by a distance measurement unit 12 at a second measurement position.

The derivation unit 184 derives a reference imaging position distance which is a distance between a first imaging position and a second imaging position, on the basis of attention pixel coordinates, three characteristic pixel coordinates, reference emission position coordinates, a focal length of an imaging lens 50, and a dimension of an imaging pixel 60A1. The derivation unit 184 adjusts the imaging position distance with reference to the derived reference imaging position distance to derive a final imaging position distance which is finally adopted as the distance between the first imaging position and the second imaging position.

In addition, the derivation unit 184 derives designated pixel three-dimensional coordinates on the basis of the derived final imaging position distance. The designated pixel three-dimensional coordinates according to the fourth embodiment are an example of final designated pixel real space coordinates according to the technique of this disclosure. The final designated pixel real space coordinates refer to three-dimensional coordinates which are finally adopted as the three-dimensional coordinates which are coordinates on the real space of an attention pixel (see step 206 illustrated in FIG. 21) which is an example of a designated pixel according to the technique of this disclosure.

Next, an imaging position distance calculation process realized by the CPU 100 executing the imaging position distance calculation program 180 will be described with reference to FIG. 26, as the operation of portions of the distance measurement device 10D according to the technique of this disclosure. Meanwhile, the same steps as those in the flowchart illustrated in FIG. 12 will be denoted by the same step numbers, and a description thereof will be omitted.

The flowchart illustrated in FIG. 26 is different from the flowchart illustrated in FIG. 12 in that steps 400 and 402 are provided instead of steps 218 and 222. In addition, the flowchart illustrated in FIG. 26 is different from the flowchart illustrated in FIG. 12 in that steps 404 to 416 are provided instead of steps 232 to 236. In addition, the flowchart illustrated in FIG. 26 is also the continuation of the flowchart illustrated in FIG. 24.

In step 400 illustrated in FIG. 26, the acquisition unit 182 determines whether or not measurement and imaging of a distance at the second position have been executed by the distance measurement device 10D. In step 400, in a case where measurement and imaging of a distance at the second position have not been executed by the distance measurement device 10D, the determination result is negative, and the process proceeds to step 220. In step 400, in a case where measurement and imaging of a distance at the second position have been executed by the distance measurement device 10D, the determination result is positive, and the process proceeds to step 402.

In step 402, the acquisition unit 182 acquires a reference distance which is a distance measured at the second position and a second captured image signal indicating a second captured image which is obtained by performing imaging at the second position, and then the process proceeds to step 224.

In step 404, the derivation unit 184 decides a first plane equation which is the plane equation shown in Expression (3) on the basis of the emission position coordinates calculated in the processing of step 214, and then the process proceeds to step 406.

In step 406, the derivation unit 184 calculates an imaging position distance on the basis of the attention pixel coordinates, the corresponding attention pixel coordinates, the focal length of the imaging lens 50, the dimension of the imaging pixel 60A1, the first plane equation, and Expression (1), and then the process proceeds to step 408.

In step 408, the derivation unit 184 calculates reference emission position coordinates on the basis of Expression (2) from the reference distance acquired by the acquisition unit 182 in the processing of step 402, a half angle of view α, an emission angle β, and a distance between reference points M, and then the process proceeds to step 410. Meanwhile, the reference distance used in the processing of step 408 is a distance corresponding to the distance L described in the first embodiment.

In step 410, the derivation unit 184 decides a second plane equation which is the plane equation shown in Expression (3) on the basis of the reference emission position coordinates derived in the processing of step 408, and then the process proceeds to step 412. That is, in step 410, the derivation unit 184 substitutes a, b, and c derived in the processing of step 230 and the reference emission position coordinates derived in the processing of step 408 for Expression (3) to decide d in Expression (3). Since a, b, and c in Expression (3) are derived in the processing of step 230, the second plane equation is decided when d in Expression (3) is decided in the processing of step 410.

In step 412, the derivation unit 184 derives a reference imaging position distance on the basis of the attention pixel coordinates, the corresponding attention pixel coordinates, the focal length of the imaging lens 50, the dimension of the imaging pixel 60A1, the second plane equation, and Expression (1), and then the process proceeds to step 414. Meanwhile, the reference imaging position distance is equivalent to “B” shown in Expression (1), and is calculated by substituting (X, Y, Z) in Expression (1), for which the attention pixel coordinates, the corresponding attention pixel coordinates, the focal length of the imaging lens 50, and the dimension of the imaging pixel 60A1 are substituted, for the second plane equation.

In step 414, the derivation unit 184 adjusts the imaging position distance calculated in the processing of step 406 with reference to the reference imaging position distance calculated in the processing of step 412 to calculate the final imaging position distance, and then the process proceeds to step 416. Here, the adjustment of the imaging position distance refers to, for example, the obtainment of an average value between the imaging position distance and the reference imaging position distance, the multiplication of the average value between the imaging position distance and the reference imaging position distance and a first adjustment coefficient, or the multiplication of the imaging position distance and a second adjustment coefficient.

Meanwhile, both the first adjustment coefficient and the second adjustment coefficient are, for example, coefficients which are uniquely determined in accordance with the reference imaging position distance. The first adjustment coefficient is derived from, for example, a correspondence table in which the reference imaging position distance and the first adjustment coefficient are associated with each other in advance, or a computational expression in which the reference imaging position distance is set to be an independent variable and the first adjustment coefficient is set to be a dependent variable. The second adjustment coefficient is similarly derived. The correspondence table and the computational expression are derived from a derivation table or a computational expression which is derived from results of experiment performed by the real machine of the distance measurement device 10D or computer simulation based on design specifications of the distance measurement device 10D at the stage before the shipment of the distance measurement device 10D.

Accordingly, examples of the final imaging position distance include an average value between the imaging position distance and the reference imaging position distance, a value obtained by multiplying the average value between the imaging position distance and the reference imaging position distance by the first adjustment coefficient, and a value obtained by multiplying the imaging position distance by the second adjustment coefficient.

In step 416, the control unit 185 displays the final imaging position distance calculated in the processing of step 414 on the display unit 86 so as to be superimposed on the second captured image, as illustrated in FIG. 27 as an example. In step 416, the control unit 185 stores the final imaging position distance calculated in the processing of step 414 in a predetermined storage region, and then terminates the imaging position distance calculation process.

Next, reference will be made to FIG. 28 to describe a three-dimensional coordinate calculation process realized by the CPU 100 executing the three-dimensional coordinate calculation program 181 in a case where a three-dimensional coordinate calculation button 90G is turned on.

In the three-dimensional coordinate calculation process illustrated in FIG. 28, first, the derivation unit 184 determines whether or not the final imaging position distance has been already calculated in the processing of step 414 included in the imaging position distance calculation process, in step 450. In step 450, in a case where the final imaging position distance has not been calculated in the processing of step 414 included in the imaging position distance calculation process, the determination result is negative, and the process proceeds to step 458. In step 450, in a case where the final imaging position distance has been already calculated in the processing of step 414 included in the imaging position distance calculation process, the determination result is positive, and the process proceeds to step 458.

In step 452, the derivation unit 184 determines whether or not a calculation start condition has been satisfied. In step 452, in a case where the calculation start condition has not been satisfied, the determination result is negative, and the process proceeds to step 458. In step 452, in a case where the calculation start condition has been satisfied, the determination result is positive, and the process proceeds to step 454.

In step 454, the derivation unit 184 calculates the designated pixel three-dimensional coordinates on the basis of the attention pixel coordinates, the corresponding attention pixel coordinates, the final imaging position distance, the focal length of the imaging lens 50, the dimension of the imaging pixel 60A1, and Expression (1), and then the process proceeds to step 456.

Meanwhile, in step 454, the designated pixel three-dimensional coordinates are calculated by substituting the attention pixel coordinates, the corresponding attention pixel coordinates, the final imaging position distance, the focal length of the imaging lens 50, and the dimension of the imaging pixel 60A1 for Expression (1).

In step 456, the control unit 185 displays the designated pixel three-dimensional coordinates calculated in the processing of step 454 on the display unit 86 so as to be superimposed on the second captured image, as illustrated in FIG. 29 as an example. In step 456, the control unit 185 stores the designated pixel three-dimensional coordinates calculated in the processing of step 454 in a predetermined storage region, and then terminates the three-dimensional coordinate calculation process.

Meanwhile, in the example illustrated in FIG. 29, (20160, 50132, 137810) corresponds to the designated pixel three-dimensional coordinates calculated in the processing of step 454. In the example illustrated in FIG. 29, the designated pixel three-dimensional coordinates are displayed in proximity to the attention pixel 126.

In step 458, the derivation unit 112 determines whether or not a condition for terminating the three-dimensional coordinate calculation process has been satisfied. In step 458, in a case where the condition for terminating the three-dimensional coordinate calculation process has not been satisfied, the determination result is negative, and the process proceeds to step 450. In step 458, in a case where the condition for terminating the three-dimensional coordinate calculation process has been satisfied, the determination result is positive, and thus the three-dimensional coordinate calculation process is terminated.

As described above, in the distance measurement device 10D, a distance from the second position to the subject is measured, and a reference distance which is the measured distance is acquired by the acquisition unit 182 (step 402). In addition, the reference emission position coordinates are calculated by the derivation unit 184 on the basis of the reference distance (step 408). In addition, the reference imaging position distance is calculated by the derivation unit 184 on the basis of the attention pixel coordinates, the corresponding attention pixel coordinates, the three characteristic pixel coordinates, the corresponding characteristic pixel coordinates, the reference emission position coordinates, the focal length of the imaging lens 50, and the dimension of the imaging pixel 60A1 (step 406). The imaging position distance is adjusted by the derivation unit 184 with reference to the reference imaging position distance, and thus the final imaging position distance is calculated (step 414). Therefore, according to the distance measurement device 10D, it is possible to calculate a distance between the first imaging position and the second imaging position with a high level of accuracy, as compared to a case where the reference imaging position distance is not used.

In the distance measurement device 10D, the designated pixel three-dimensional coordinates are calculated on the basis of the final imaging position distance calculated in the imaging position distance calculation process (see FIG. 28). Therefore, according to the distance measurement device 10D, it is possible to calculate the designated pixel three-dimensional coordinates with a high level of accuracy, as compared to a case where the final imaging position distance is not used.

Further, in the distance measurement device 10D, the designated pixel three-dimensional coordinates are specified on the basis of the attention pixel coordinates, the corresponding attention pixel coordinates, the final imaging position distance, the focal length of the imaging lens 50, and the dimension of the imaging pixel 60A1 (see Expression (1)). Therefore, according to the distance measurement device 10D, it is possible to derive the designated pixel three-dimensional coordinates with a high level of accuracy, as compared to a case where the designated pixel three-dimensional coordinates are not specified on the basis of the final imaging position distance, the attention pixel coordinates, the corresponding attention pixel coordinates, the focal length of the imaging lens 50, and the dimension of the imaging pixel 60A1.

Meanwhile, in the fourth embodiment, a distance measured on the basis of a laser beam emitted from the second position is set to be the reference distance, but the technique of this disclosure is not limited thereto. For example, a distance measured on the basis of a laser beam emitted from the first position may be set to be the reference distance.

Fifth Embodiment

In the above-described embodiments, a description has been given of a case where an imaging position distance and the like are derived by one distance measurement device, but a description will be given of a case where an imaging position distance and the like are derived by two of a distance measurement devices and a personal computer (hereinafter, referred to as a PC) in a fifth embodiment. Meanwhile, PC stands for a Personal Computer. Meanwhile, in the fifth embodiment, the same components as those described in the above-described embodiments will be denoted by the same reference numerals and signs, and a description thereof will be omitted.

As illustrated in FIG. 30 as an example, an information processing system 500 according to the fifth embodiment includes distance measurement devices 10E1 and 10E2, and a PC 502. Meanwhile, in the fifth embodiment, the PC 502 can communicate with the distance measurement devices 10E1 and 10E2. In the fifth embodiment, the PC 502 is an example of an information processing device according to the technique of this disclosure.

As illustrated in FIG. 30 as an example, the distance measurement device 10E1 is disposed at a first position, and the distance measurement device 10E2 is disposed at a second position different from the first position.

As illustrated in FIG. 31 as an example, the distance measurement devices 10E1 and 10E2 have the same configuration. Meanwhile, hereinafter, the distance measurement devices 10E1 and 10E2 will be referred to as a “distance measurement device 10E” in a case where it is not necessary to give a description by distinguishing between the distance measurement devices.

The distance measurement device 10E is different from the distance measurement device 10A in that an imaging device 15 is provided instead of the imaging device 14. The imaging device 15 is different from the imaging device 14 in that an imaging device main body 19 is provided instead of the imaging device main body 18.

The imaging device main body 19 is different from the imaging device main body 18 in that a communication I/F 83 is provided. The communication I/F 83 is connected to a bus line 84, and is operated under the control of a main control unit 62.

The communication I/F 83 is connected to a communication network (not shown) such as the Internet, and transmits and receives various information to and from the PC 502 connected to the communication network.

As illustrated in FIG. 32 as an example, the PC 502 includes a main control unit 503. The main control unit 503 includes a CPU 504, a primary storage unit 506, and a secondary storage unit 508. The CPU 504, the primary storage unit 506, and the secondary storage unit 508 are connected to each other through a bus line 510.

In addition, the PC 502 includes a communication I/F 512. The communication I/F 512 is connected to the bus line 510, and is operated under the control of the main control unit 503. The communication I/F 512 is connected to the communication network, and transmits and receives various information to and from the distance measurement device 10E connected to the communication network.

In addition, the PC 502 includes a reception unit 513 and a display unit 514. The reception unit 513 is connected to the bus line 510 through a reception I/F (not shown), and the reception I/F outputs an instruction content signal indicating contents of an instruction received by the reception unit 513 to the main control unit 503. Meanwhile, the reception unit 513 is realized by, for example, a keyboard, a mouse, and a touch panel.

The display unit 514 is connected to the bus line 510 through a display control unit (not shown), and displays various information under the control of the display control unit. Meanwhile, the display unit 514 is realized by, for example, an LCD.

The secondary storage unit 508 stores the imaging position distance calculation program 106 (150, 168, 180) and the three-dimensional coordinate calculation program 108 (181) which are described in the above-described embodiments. Meanwhile, hereinafter, for convenience of description, the imaging position distance calculation programs 106, 150, 168, and 180 will be referred to as an “imaging position distance calculation program” without a reference numeral in a case where it is not necessary to give a description by distinguishing between the imaging position distance calculation programs. In addition, hereinafter, for convenience of description, the three-dimensional coordinate calculation programs 108 and 181 will be referred to as a “three-dimensional coordinate calculation program” without a reference numeral in a case where it is not necessary to give a description by distinguishing between the three-dimensional coordinate calculation programs.

The CPU 504 acquires a first captured image signal, attention pixel coordinates, a distance, and the like from the distance measurement device 10E1 through the communication I/F 512. In addition, the CPU 504 acquires a second captured image signal and the like from the distance measurement device 10E2 through the communication I/F 512.

The CPU 504 reads out the imaging position distance calculation program and the three-dimensional coordinate calculation program from the secondary storage unit 508 and develops the read-out imaging position distance calculation program and three-dimensional coordinate calculation program to the primary storage unit 506 to execute the imaging position distance calculation program and the three-dimensional coordinate calculation program. Meanwhile, hereinafter, for convenience of description, the imaging position distance calculation program and the three-dimensional coordinate calculation program are collectively referred to as a “calculation program”.

The CPU 100 executes the calculation programs to be operated as the acquisition unit 110 (154, 172, 182), the derivation unit 112 (174, 184), and the control unit 114 (156, 176, 185).

Accordingly, in the information processing system 500, the PC 502 acquires the first captured image signal, second captured image signal, the attention pixel coordinates, the distance, and the like from the distance measurement device 10E through the communication I/F 512 and then executes the calculation programs, and thus the same operations and effects as those in the above-described embodiments are obtained.

Sixth Embodiment

In the first embodiment, a description has been given of a case where the distance measurement device 10A is realized by the distance measurement unit 12 and the imaging device 14, but a description will be given of a distance measurement device 10F which is realized by further including a smart device 602 in a sixth embodiment. Meanwhile, in the sixth embodiment, the same components as those in the above-described embodiments will be denoted by the same reference numerals and signs, and a description thereof will be omitted, and only different portions from the above-described embodiments will be described.

As illustrated in FIG. 33 as an example, the distance measurement device 10F according to the third embodiment is different from the distance measurement device 10A according to the first embodiment in that an imaging device 600 is provided instead of the imaging device 14. In addition, the distance measurement device 10F is different from the distance measurement device 10A in that a smart device 602 is provided.

The imaging device 600 is different from the imaging device 14 in that an imaging device main body 603 is provided instead of the imaging device main body 18.

The imaging device main body 603 is different from the imaging device main body 18 in that a wireless communication unit 604 and a wireless communication antenna 606 are provided.

The wireless communication unit 604 is connected to a bus line 84 and the wireless communication antenna 606. The main control unit 62 outputs transmission target information, which is information to be transmitted to the smart device 602, to the wireless communication unit 604.

The wireless communication unit 604 transmits the transmission target information, which is input from the main control unit 62, to the smart device 602 by radio waves through the wireless communication antenna 606. In addition, when the radio waves from the smart device 602 are received by the wireless communication antenna 606, the wireless communication unit 604 acquires a signal based on the received radio waves, and outputs the acquired signal to the main control unit 62.

The smart device 602 includes a CPU 608, a primary storage unit 610, and a secondary storage unit 612. The CPU 608, the primary storage unit 610, and the secondary storage unit 612 are connected to a bus line 614.

The CPU 608 controls the entire distance measurement device 10F, inclusive of the smart device 602. The primary storage unit 610 is a volatile memory which is used as a work area and the like during the execution of various programs. An example of the primary storage unit 610 is a RAM. The secondary storage unit 612 is a non-volatile memory that stores a control program for controlling the overall operation of the distance measurement device 10F, various parameters, and the like, inclusive of the smart device 602. An example of the secondary storage unit 612 is a flash memory or an EEPROM.

The smart device 142 includes a display unit 615, a touch panel 616, a wireless communication unit 618, and a wireless communication antenna 620.

The display unit 615 is connected to the bus line 614 through a display control unit (not shown), and displays various information under the control of the display control unit. Meanwhile, the display unit 615 is realized by, for example, an LCD.

The touch panel 616 is superimposed on a display screen of the display unit 615, and receives a touch by an indicator. The touch panel 616 is connected to the bus line 614 through a touch panel I/F (not shown), and outputs positional information indicating a position touched by the indicator to the touch panel I/F. The touch panel I/F is operated in accordance with an instruction of the CPU 608, and outputs the positional information, which is input from the touch panel 616, to the CPU 608.

Soft keys equivalent to a measurement and imaging button 90A, an imaging button 90B, an imaging system operation mode switching button 90C, a wide angle instruction button 90D, a telephoto instruction button 90E, an imaging position distance calculation button 90F, a three-dimensional coordinate calculation button 90G, and the like are displayed on the display unit 615.

For example, as illustrated in FIG. 34, a measurement and imaging button 90A1 functioning as the measurement and imaging button 90A is displayed on the display unit 615 as a soft key, and is pressed down by the user through the touch panel 616. In addition, for example, an imaging button 90B1 functioning as the imaging button 90B is displayed on the display unit 615 as a soft key, and is pressed down by the user through the touch panel 616. In addition, for example, an imaging system operation mode switching button 90C1 functioning as the imaging system operation mode switching button 90C is displayed on the display unit 615 as a soft key, and is pressed down by the user through the touch panel 616.

In addition, for example, a wide angle instruction button 90D1 functioning as the wide angle instruction button 90D is displayed on the display unit 615 as a soft key, and is pressed down by the user through the touch panel 616. Further, for example, a telephoto instruction button 90E1 functioning as the telephoto instruction button 90E is displayed on the display unit 615 as a soft key, and is pressed down by the user through the touch panel 616.

In addition, for example, an imaging position distance calculation button 90F1 functioning as the imaging position distance calculation button 90F is displayed on the display unit 615 as a soft key, and is pressed down by the user through the touch panel 616. In addition, for example, a three-dimensional coordinate calculation button 90G1 functioning as the three-dimensional coordinate calculation button 90G is displayed on the display unit 615 as a soft key, and is pressed down by the user through the touch panel 616.

The wireless communication unit 618 is connected to the bus line 614 and the wireless communication antenna 620. The wireless communication unit 618 transmits a signal, which is input from the CPU 608, to the imaging device main body 603 by radio waves through the wireless communication antenna 620. In addition, when the radio waves are received by the wireless communication antenna 620 from the imaging device main body 603, the wireless communication unit 618 acquires a signal based on the received radio waves and outputs the acquired signal to the CPU 608. Therefore, the imaging device main body 603 is controlled by the smart device 602 through wireless communication performed between the smart device 602 and the imaging device main body 603.

The secondary storage unit 612 stores a calculation program. The CPU 608 reads out the calculation program from the secondary storage unit 612 and develops the read-out calculation program to the primary storage unit 610 to execute the calculation program.

The CPU 608 executes the calculation program to be operated as the acquisition unit 110 (154, 172, 182), the derivation unit 112 (174, 184), and the control unit 114 (156, 176, 185). For example, the CPU 608 executes the imaging position distance calculation program 106, and thus the imaging position distance calculation process described in the first embodiment is realized. In addition, for example, the CPU 608 executes the three-dimensional coordinate calculation program 108, and thus the three-dimensional calculation process described in the first embodiment is realized.

Therefore, in the distance measurement device 10F, the smart device 602 executes the calculation program, and thus the same operations and effects as those in the above-described embodiments are obtained. In addition, according to the distance measurement device 10F, it is possible to reduce a load applied to the imaging device 600 in obtaining the effects described in the above-described embodiments, as compared to a case where the imaging position distance calculation process and the three-dimensional calculation process are executed by the imaging device 600.

Meanwhile, in the above-described embodiments, a corresponding attention pixel is specified by executing image analysis with a second captured image as an object to be analyzed, and corresponding attention pixel coordinates for specifying the specified corresponding attention pixel are acquired (see step 226 illustrated in FIG. 12), but the technique of this disclosure is not limited thereto. For example, the user may designate a pixel corresponding to an attention pixel as the corresponding attention pixel from the second captured image through the touch panel 88.

In the above-described embodiments, a description has been given of a case where the derivation unit 112 (174, 184) calculates emission position coordinates, the direction of a plane, an imaging position distance, designated pixel three-dimensional coordinates, and the like by using a computational expression, but the technique of this disclosure is not limited thereto. For example, the derivation unit 112 (174, 184) may calculate emission position coordinates, the direction of a plane, an imaging position distance, designated pixel three-dimensional coordinates, and the like by using a table in which an independent variable of the computational expression is set to be an input and a dependent variable of the computational expression is set to be an output.

In the above-described embodiments, a description has been given of a case where the calculation program is read out from the secondary storage unit 104 (508,612), but the calculation program is not necessarily stored in the secondary storage unit 104 (508,612) from the beginning. For example, as illustrated in FIG. 35, the calculation program may be first stored in any portable storage medium 700 such as a Solid State Drive (SSD) or a Universal Serial Bus (USB) memory. In this case, the calculation program of the storage medium 700 is installed in the distance measurement device 10A (10B, 10C, 10D, 10F) (hereinafter, referred to as “distance measurement device 10A and the like”) or the PC 502, and the installed calculation program is executed by the CPU 100 (608).

In addition, the calculation program may be stored in a storage unit of another computer or a server device connected to the distance measurement device 10A and the like or the PC 502 through a communication network (not shown), and the calculation program may be downloaded in accordance with requests of the distance measurement device 10A and the like. In this case, the downloaded calculation program is executed by the CPU 100 (608).

In the above-described embodiments, a description has been given of a case where various information such as an emission position mark 136, an imaging position distance, and designated pixel three-dimensional coordinates is displayed on the display unit 86, but the technique of this disclosure is not limited thereto. For example, various information may be displayed on a display unit of an external device which is used by being connected to the distance measurement device 10A and the like or the PC 502. An example of the external device is a PC or a spectacles-type or wristwatch type wearable terminal device.

In the above-described embodiments, a description has been given of a case where the emission position mark 136, the imaging position distance, the designated pixel three-dimensional coordinates, and the like are visibly displayed by the display unit 86, but the technique of this disclosure is not limited thereto. For example, audible display such as the output of a sound using a sound reproducing device or permanent visible display such as the output of printed matter using a printer may be performed instead of the visible display or may be performed in combination.

In the above-described embodiments, a description has been given of a case where the emission position mark 136, the imaging position distance, the designated pixel three-dimensional coordinates, and the like are displayed on the display unit 86, but the technique of this disclosure is not limited thereto. For example, at least one of the emission position mark 136, the imaging position distance, the designated pixel three-dimensional coordinates, and the like may be displayed on a display unit (not shown) different from the display unit 86, and the remainders may be displayed on the display unit 86. The emission position mark 136, the imaging position distance, the designated pixel three-dimensional coordinates, and the like may be individually displayed on a plurality of display units including the display unit 86.

In the above-described embodiments, a laser beam has been described as light for distance measurement. However, the technique of this disclosure is not limited thereto, and a directional light which is directional light may be used. For example, the directional light may be directional light beam obtained by a Light Emitting Diode ((LED) or a Super Luminescent Diode ((SLD). It is preferable that directivity of the directional light beam is the same degree of directivity as that of the directivity of the laser beam and is usable in distance measurement, for example, within a range between several meters and several kilometers.

In addition, the imaging position distance calculation process and the three-dimensional coordinate calculation process described in the above-described embodiments are just examples. Therefore, it is needless to say that the deletion of unnecessary steps, the addition of new steps, and the change of processing order may be performed without departing from the scope of the invention. In addition, each processing included in the imaging position distance calculation process and the three-dimensional coordinate calculation process may be realized only by a hardware configuration such as ASIC, or may be realized by a combination of a software configuration and a hardware configuration using a computer

In the above-described embodiments, for convenience of description, a description has been given of a case where the distance measurement unit 12 is mounted on the side surface of the imaging device main body 18 included in the distance measurement device 10A and the like, but the technique of this disclosure is not limited thereto. For example, the distance measurement unit 12 may be mounted on the upper surface or the lower surface of the imaging device main body 18. In addition, for example, as illustrated in FIG. 36, a distance measurement device 10G may be applied instead of the distance measurement device 10A and the like. As illustrated in FIG. 36 as an example, the distance measurement device 10G is different from the distance measurement device 10A and the like in that a distance measurement unit 12A is provided instead of the distance measurement unit 12 and an imaging device main body 18A is provided instead of the imaging device main body 18.

In the example illustrated in FIG. 36, the distance measurement unit 12A is accommodated in a housing 18A1 of the imaging device main body 18A, and objective lenses 32 and 38 are exposed from the housing 18A1 on the front side (a side where the imaging lens 50 is exposed) of the distance measurement device 10G. In addition, it is preferable that the distance measurement unit 12A is disposed such that optical axes L1 and L2 are set to be at the same height. Meanwhile, an opening (not shown) through which the distance measurement unit 12A can be inserted into and removed from the housing 18A1 may be formed in the housing 18A1.

Meanwhile, the half angle of view α used in the processing of step 214 included in the imaging position distance calculation process according to the first embodiment and the half angle of view α used in the processing of step 408 included in the imaging position distance calculation process according to the fourth embodiment are derived on the basis of the following Expression (7). In Expression (7), “f₀” denotes a focal length.

$\begin{matrix} {\alpha = {{atan}\left\{ \frac{\left( {{dimension}\mspace{14mu} {of}\mspace{14mu} {imaging}\mspace{14mu} {pixel}} \right)}{2 \times f_{0}} \right\}}} & (7) \end{matrix}$

All the documents, patent applications, and technical specifications described in the present specification are incorporated into the present specification by reference, to the same extent as in a case where the individual documents, patent applications, and technical specifications were specifically and individually described as being incorporated by reference.

With regard to the above-described embodiments, the following appendixes will be further disclosed.

(Appendix 1)

-   -   An information processing device including:     -   an acquisition unit that acquires a first captured image         obtained by imaging a subject from a first imaging position, a         second captured image obtained by imaging the subject from a         second imaging position different from the first imaging         position, and a distance from one of a position corresponding to         the first imaging position and a position corresponding to the         second imaging position to the subject, the distance being         measured by emitting directional light, which has directivity,         to the subject and receiving a reflected light of the         directional light beam; and     -   a derivation unit that derives an imaging position distance         which is a distance between the first imaging position and the         second imaging position, on the basis of designated pixel         coordinates which are coordinates for specifying designated         pixels designated as pixels corresponding to a position on a         real space in each of the first captured image and the second         captured image which are acquired by the acquisition unit, a         plurality of pixel coordinates being a plurality of coordinates         for specifying a plurality of pixels of more than three pixels         which are present in the same planar region as an emission         position irradiated with the directional light beam on the real         space and correspond to the position on the real space in each         of the first captured image and the second captured image which         are acquired by the acquisition unit, emission position         coordinates which specifies the emission position on the real         space and are derived on the basis of the distance acquired by         the acquisition unit, a focal length of an imaging lens used for         the imaging of the subject, and dimensions of imaging pixels         included in an imaging pixel group for imaging the subject.

(Appendix 2)

-   -   The information processing device according to Appendix 1,     -   wherein the derivation unit derives designated pixel real space         coordinates which are coordinates of the designated pixels on         the real space on the basis of the derived imaging position         distance.

(Appendix 3)

-   -   The information processing device according to Appendix 2,     -   wherein the designated pixel real space coordinates are         specified on the basis of the imaging position distance, the         designated pixel coordinates, the focal length, and the         dimensions.

(Appendix 4)

-   -   The information processing device according to any one of         Appendixes 1 to 3,     -   wherein the derivation unit derives a direction of a plane,         including coordinates on the real space which correspond to the         plurality of pixel coordinates, which is specified by a plane         equation indicating the plane on the basis of the plurality of         pixel coordinates, the focal length, and the dimensions, decides         the plane equation on the basis of the derived direction and the         emission position coordinates, and derives the imaging position         distance on the basis of the decided plane equation, the         designated pixel coordinates, the focal length, and the         dimensions.

(Appendix 5)

-   -   The information processing device according to any one of         Appendixes 1 to 4,     -   wherein the plurality of pixels are designated by first pixel         designation information for designating a pixel from each of the         first captured image and the second captured image, the first         pixel designation information being received by a first         reception unit receiving the first pixel designation         information, and     -   wherein the acquisition unit acquires a plurality of coordinates         for specifying the plurality of pixels designated in accordance         with the first pixel designation information as the plurality of         pixel coordinates, and the derivation unit derives the imaging         position distance on the basis of the designated pixel         coordinates, the plurality of pixel coordinates acquired by the         acquisition unit, the emission position coordinates, the focal         length, and the dimensions.

(Appendix 6)

-   -   The information processing device according to any one of         Appendixes 1 to 4,     -   wherein the acquisition unit acquires a plurality of         coordinates, as the plurality of pixel coordinates, for         specifying a plurality of characteristic pixels more than three         pixels which are present in the same planar region as the         emission position on the real space and correspond to the         position on the real space in each of the first captured image         and the second captured image, and     -   wherein the derivation unit derives the imaging position         distance on the basis of the designated pixel coordinates, the         plurality of pixel coordinates acquired by the acquisition unit,         the emission position coordinates, the focal length, and the         dimensions.

(Appendix 7)

-   -   The information processing device according to Appendix 6,     -   wherein the plurality of characteristic pixels are a         predetermined number of pixels more than three pixels which are         present in the same planar region as the emission position on         the real space and correspond to the position on the real space         in each of the first captured image and the second captured         image, and are a plurality of pixels for maximizing an area         surrounded.

(Appendix 8)

-   -   The information processing device according to Appendix 6,         further including:     -   a first control unit that performs control of displaying at         least one of the first captured image and the second captured         image on a first display unit, and displaying a corresponding         region corresponding to the same planar region as the emission         position within a display region so as to be distinguishable         from the other regions,     -   wherein the acquisition unit acquires a plurality of coordinates         for specifying the plurality of characteristic pixels as the         plurality of characteristic pixels coordinates, from a portion         of the corresponding region designated in accordance with region         designation information received by a second reception unit         receiving the region designation information for designating a         portion of the corresponding region in a state where the         corresponding region is displayed on the first display unit.

(Appendix 9)

-   -   The information processing device according to any one of         Appendixes 1 to 8,     -   wherein the designated pixel related to one of the first         captured image and the second captured image is a pixel which is         designated in accordance with second pixel designation         information received by a third reception unit receiving the         second pixel designation information for designating a pixel         from one of the first captured image and the second captured         image, and     -   wherein the designated pixel related to the other one of the         first captured image and the second captured image is a pixel         which is included in the other one of the first captured image         and the second captured image and corresponds to a position of         the pixel designated in accordance with the second pixel         designation information on the real space.

(Appendix 10)

-   -   The information processing device according to any one of         Appendixes 1 to 9, further including:     -   a measurement unit that measures the distance by emitting the         directional light beam and receiving the reflected light,     -   wherein the acquisition unit acquires the distance measured by         the measurement unit.

(Appendix 11)

-   -   The information processing device according to any one of         Appendixes 1 to 10, further including:     -   an imaging unit that images the subject,     -   wherein the acquisition unit that acquires the first captured         image obtained by imaging the subject by the imaging unit from         the first imaging position, and the second captured image         obtained by imaging the subject by the imaging unit from the         second imaging position.

(Appendix 12)

-   -   The information processing device according to any one of         Appendixes 1 to 11,     -   wherein the acquisition unit further acquires a reference         distance to the subject which is measured by emitting the         directional light beam to the subject from the other one of the         position corresponding to the first imaging position and the         position corresponding to the second imaging position and         receiving the reflected light of the directional light beam,     -   wherein the derivation unit further derives a reference imaging         position distance which is the distance between the first         imaging position and the second imaging position on the basis of         the designated pixel coordinates, the plurality of pixel         coordinates, reference emission position coordinates for         specifying the emission position on the real space and derived         on the basis of the reference distance acquired by the         acquisition unit, the focal length, and the dimensions, and         adjusts the imaging position distance with reference to the         derived reference imaging position distance to derive a final         imaging position distance which is finally adopted as the         distance between the first imaging position and the second         imaging position.

(Appendix 13)

-   -   The information processing device according to Appendix 12,     -   wherein the derivation unit derives final designated pixel real         space coordinates which are finally adopted as the coordinates         of the designated pixels on the real space, on the basis of the         derived final imaging position distance.

(Appendix 14)

-   -   The information processing device according to Appendix 13,     -   wherein the final designated pixel real space coordinates are         specified on the basis of the final imaging position distance,         the designated pixel coordinates, the focal length, and the         dimensions.

(Appendix 15)

-   -   The information processing device according to any one of         Appendixes 1 to 14, further including:     -   a second control unit that performs control of displaying         derivation results of the derivation unit on a second display         unit.

(Appendix 16)

-   -   An information processing method including:     -   acquiring a first captured image obtained by imaging a subject         from a first imaging position, a second captured image obtained         by imaging the subject from a second imaging position different         from the first imaging position, and a distance from one of a         position corresponding to the first imaging position and a         position corresponding to the second imaging position to the         subject, the distance being measured by emitting directional         light, which has directivity, to the subject and receiving a         reflected light of the directional light beam; and     -   deriving an imaging position distance which is a distance         between the first imaging position and the second imaging         position, on the basis of designated pixel coordinates which are         coordinates for specifying designated pixels designated as         pixels corresponding to a position on a real space in each of         the acquired first captured image and second captured image, a         plurality of pixel coordinates being a plurality of coordinates         for specifying a plurality of pixels of more than three pixels         which are present in the same planar region as an emission         position irradiated with the directional light beam on the real         space and correspond to the position on the real space in each         of the acquired first captured image and second captured image,         emission position coordinates which specifies the emission         position on the real space and are derived on the basis of the         acquired distance, a focal length of an imaging lens used for         the imaging of the subject, and dimensions of imaging pixels         included in an imaging pixel group for imaging the subject.

(Appendix 17)

-   -   A program causing a computer to execute processes of:     -   acquiring a first captured image obtained by imaging a subject         from a first imaging position, a second captured image obtained         by imaging the subject from a second imaging position different         from the first imaging position, and a distance from one of a         position corresponding to the first imaging position and a         position corresponding to the second imaging position to the         subject, the distance being measured by emitting directional         light, which has directivity, to the subject and receiving a         reflected light of the directional light beam; and     -   deriving an imaging position distance which is a distance         between the first imaging position and the second imaging         position, on the basis of designated pixel coordinates which are         coordinates for specifying designated pixels designated as         pixels corresponding to a position on a real space in each of         the acquired first captured image and second captured image, a         plurality of pixel coordinates being a plurality of coordinates         for specifying a plurality of pixels of more than three pixels         which are present in the same planar region as an emission         position irradiated with the directional light beam on the real         space and correspond to the position on the real space in each         of the acquired first captured image and second captured image,         emission position coordinates which specifies the emission         position on the real space and are derived on the basis of the         acquired distance, a focal length of an imaging lens used for         the imaging of the subject, and dimensions of imaging pixels         included in an imaging pixel group for imaging the subject. 

What is claimed is:
 1. An information processing device comprising: a display; a processor; and a memory that is connected to or built in the processor, wherein the processor is configured to acquire a first captured image obtained by imaging a subject from a first imaging position, a second captured image obtained by imaging the subject from a second imaging position different from the first imaging position, a first distance from a position corresponding to the first imaging position to the subject, and a second distance from a position corresponding to the second imaging position to the subject, display the first captured image or the second captured image on the display, specify a first position designated on the display on which the first captured image is displayed and a second position designated on the display on which the second captured image is displayed, and derive a distance in a real space based on the first distance, the second distance, the first position and the second position.
 2. The information processing device according to claim 1, wherein the processor further configured to specify a position in the second captured image corresponding to the first position in the real space.
 3. The information processing device according to claim 1, wherein the processor displays the first position in a different manner from other pixels on the display.
 4. The information processing device according to claim 1, wherein the processor displays the second position in a different manner from other pixels on the display.
 5. The information processing device according to claim 1, wherein the display has a function that detects a touch of an user, and the processor displays a plurality of soft keys including a key used for a distance measurement and a key used for imaging.
 6. The information processing device according to claim 2, wherein the display has a function that detects a touch of an user, and the processor displays a plurality of soft keys including a key used for a distance measurement and a key used for imaging.
 7. The information processing device according to claim 3, wherein the display has a function that detects a touch of an user, and the processor displays a plurality of soft keys including a key used for a distance measurement and a key used for imaging.
 8. The information processing device according to claim 5, wherein the plurality of soft keys include more than three soft keys, and the processor displays the plurality of soft keys on a same straight line.
 9. The information processing device according to claim 6, wherein the plurality of soft keys include more than three soft keys, and the processor displays the plurality of soft keys on a same straight line.
 10. The information processing device according to claim 7, wherein the plurality of soft keys include more than three soft keys, and the processor displays the plurality of soft keys on a same straight line.
 11. The information processing device according to claim 8, wherein the same straight line is parallel to one side of the display.
 12. The information processing device according to claim 9, wherein the same straight line is parallel to one side of the display.
 13. The information processing device according to claim 1, wherein the processor displays the distance in the real space on the display so as to be superimposed on the second captured image.
 14. The information processing device according to claim 2, wherein the processor displays the distance in the real space on the display so as to be superimposed on the second captured image.
 15. The information processing device according to claim 3, wherein the processor displays the distance in the real space on the display so as to be superimposed on the second captured image.
 16. The information processing device according to claim 1, wherein the processor acquires the first distance on the basis of a timing when directional light which has directivity is emitted to the subject from the position corresponding to the first imaging position and a timing when reflected light of the directional light from the position corresponding to the first imaging position is received, and acquires the second distance on the basis of a timing when directional light which has directivity is emitted to the subject from the position corresponding to the second imaging position and a timing when reflected light of the directional light from the position corresponding to the second imaging position is received.
 17. The information processing device according to claim 1, further comprising: an image sensor that images the subject, wherein the processor acquires the first captured image obtained by imaging the subject by the image sensor from the first imaging position, and the second captured image obtained by imaging the subject by the image sensor from the second imaging position.
 18. The information processing device according to claim 16, further comprising: a body that houses the processor; an image sensor that images the subject; a first lens that is used for emitting the directional light; a second lens that is used for receiving reflected light of the directional light; and a third lens that is used for imaging the subject, the first lens, the second lens, and the third lens are provided on a same surface of the body and a same straight line.
 19. An information processing method comprising: acquiring a first captured image obtained by imaging a subject from a first imaging position, a second captured image obtained by imaging the subject from a second imaging position different from the first imaging position, a first distance from a position corresponding to the first imaging position to the subject, and a second distance from a position corresponding to the second imaging position to the subject; displaying the first captured image or the second captured image on a display; specifying a first position designated on the display on which the first captured image is displayed and a second position designated on the display on which the second captured image is displayed; and deriving a distance in a real space based on the first distance, the second distance, the first position and the second position.
 20. A non-transitory computer-readable storage medium storing a program for causing a computer to execute a process comprising: acquiring a first captured image obtained by imaging a subject from a first imaging position, a second captured image obtained by imaging the subject from a second imaging position different from the first imaging position, a first distance from a position corresponding to the first imaging position to the subject, and a second distance from a position corresponding to the second imaging position to the subject; displaying the first captured image or the second captured image on a display; specifying a first position designated on the display on which the first captured image is displayed and a second position designated on the display on which the second captured image is displayed; and deriving a distance in a real space based on the first distance, the second distance, the first position and the second position. 